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ts_parser_test.go
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ts_parser_test.go
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package js_parser
import (
"testing"
"github.com/evanw/esbuild/internal/compat"
"github.com/evanw/esbuild/internal/config"
)
func expectParseErrorTS(t *testing.T, contents string, expected string) {
t.Helper()
expectParseErrorCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
})
}
func expectParseErrorTargetTS(t *testing.T, esVersion int, contents string, expected string) {
t.Helper()
expectParseErrorCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
UnsupportedJSFeatures: compat.UnsupportedJSFeatures(map[compat.Engine][]int{
compat.ES: {esVersion},
}),
})
}
func expectPrintedTS(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
})
}
func expectPrintedMangleTS(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
MinifySyntax: true,
})
}
func expectPrintedTargetTS(t *testing.T, esVersion int, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
UnsupportedJSFeatures: compat.UnsupportedJSFeatures(map[compat.Engine][]int{
compat.ES: {esVersion},
}),
})
}
func expectParseErrorTSNoAmbiguousLessThan(t *testing.T, contents string, expected string) {
t.Helper()
expectParseErrorCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
NoAmbiguousLessThan: true,
},
})
}
func expectPrintedTSNoAmbiguousLessThan(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
NoAmbiguousLessThan: true,
},
})
}
func expectParseErrorTSX(t *testing.T, contents string, expected string) {
t.Helper()
expectParseErrorCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
JSX: config.JSXOptions{
Parse: true,
},
})
}
func expectPrintedTSX(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, expected, config.Options{
TS: config.TSOptions{
Parse: true,
},
JSX: config.JSXOptions{
Parse: true,
},
})
}
func TestTSTypes(t *testing.T) {
expectPrintedTS(t, "let x: T extends number\n ? T\n : number", "let x;\n")
expectPrintedTS(t, "let x: {y: T extends number ? T : number}", "let x;\n")
expectPrintedTS(t, "let x: {y: T \n extends: number}", "let x;\n")
expectPrintedTS(t, "let x: {y: T \n extends?: number}", "let x;\n")
expectPrintedTS(t, "let x: (number | string)[]", "let x;\n")
expectPrintedTS(t, "let x: [string[]?]", "let x;\n")
expectPrintedTS(t, "let x: [number?, string?]", "let x;\n")
expectPrintedTS(t, "let x: [a: number, b?: string, ...c: number[]]", "let x;\n")
expectPrintedTS(t, "type x =\n A\n | B\n C", "C;\n")
expectPrintedTS(t, "type x =\n | A\n | B\n C", "C;\n")
expectPrintedTS(t, "type x =\n A\n & B\n C", "C;\n")
expectPrintedTS(t, "type x =\n & A\n & B\n C", "C;\n")
expectPrintedTS(t, "type x = [-1, 0, 1]\n[]", "[];\n")
expectPrintedTS(t, "type x = [-1n, 0n, 1n]\n[]", "[];\n")
expectPrintedTS(t, "type x = {0: number, readonly 1: boolean}\n[]", "[];\n")
expectPrintedTS(t, "type x = {'a': number, readonly 'b': boolean}\n[]", "[];\n")
expectPrintedTS(t, "type\nFoo = {}", "type;\nFoo = {};\n")
expectParseErrorTS(t, "export type\nFoo = {}", "<stdin>: ERROR: Unexpected newline after \"type\"\n")
expectPrintedTS(t, "let x: {x: 'a', y: false, z: null}", "let x;\n")
expectPrintedTS(t, "let x: {foo(): void}", "let x;\n")
expectPrintedTS(t, "let x: {['x']: number}", "let x;\n")
expectPrintedTS(t, "let x: {['x'](): void}", "let x;\n")
expectPrintedTS(t, "let x: {[key: string]: number}", "let x;\n")
expectPrintedTS(t, "let x: {[keyof: string]: number}", "let x;\n")
expectPrintedTS(t, "let x: {[readonly: string]: number}", "let x;\n")
expectPrintedTS(t, "let x: {[infer: string]: number}", "let x;\n")
expectPrintedTS(t, "let x: [keyof: string]", "let x;\n")
expectPrintedTS(t, "let x: [readonly: string]", "let x;\n")
expectPrintedTS(t, "let x: [infer: string]", "let x;\n")
expectParseErrorTS(t, "let x: A extends B ? keyof : string", "<stdin>: ERROR: Unexpected \":\"\n")
expectParseErrorTS(t, "let x: A extends B ? readonly : string", "<stdin>: ERROR: Unexpected \":\"\n")
expectParseErrorTS(t, "let x: A extends B ? infer : string", "<stdin>: ERROR: Unexpected \":\"\n")
expectParseErrorTS(t, "let x: {[new: string]: number}", "<stdin>: ERROR: Expected \"(\" but found \":\"\n")
expectParseErrorTS(t, "let x: {[import: string]: number}", "<stdin>: ERROR: Expected \"(\" but found \":\"\n")
expectParseErrorTS(t, "let x: {[typeof: string]: number}", "<stdin>: ERROR: Expected identifier but found \":\"\n")
expectPrintedTS(t, "let x: () => void = Foo", "let x = Foo;\n")
expectPrintedTS(t, "let x: new () => void = Foo", "let x = Foo;\n")
expectPrintedTS(t, "let x = 'x' as keyof T", "let x = \"x\";\n")
expectPrintedTS(t, "let x = [1] as readonly [number]", "let x = [1];\n")
expectPrintedTS(t, "let x = 'x' as keyof typeof Foo", "let x = \"x\";\n")
expectPrintedTS(t, "let fs: typeof import('fs') = require('fs')", "let fs = require(\"fs\");\n")
expectPrintedTS(t, "let fs: typeof import('fs').exists = require('fs').exists", "let fs = require(\"fs\").exists;\n")
expectPrintedTS(t, "let fs: typeof import('fs', { assert: { type: 'json' } }) = require('fs')", "let fs = require(\"fs\");\n")
expectPrintedTS(t, "let fs: typeof import('fs', { assert: { 'resolution-mode': 'import' } }) = require('fs')", "let fs = require(\"fs\");\n")
expectPrintedTS(t, "let x: <T>() => Foo<T>", "let x;\n")
expectPrintedTS(t, "let x: new <T>() => Foo<T>", "let x;\n")
expectPrintedTS(t, "let x: <T extends object>() => Foo<T>", "let x;\n")
expectPrintedTS(t, "let x: new <T extends object>() => Foo<T>", "let x;\n")
expectPrintedTS(t, "type Foo<T> = {[P in keyof T]?: T[P]}", "")
expectPrintedTS(t, "type Foo<T> = {[P in keyof T]+?: T[P]}", "")
expectPrintedTS(t, "type Foo<T> = {[P in keyof T]-?: T[P]}", "")
expectPrintedTS(t, "type Foo<T> = {readonly [P in keyof T]: T[P]}", "")
expectPrintedTS(t, "type Foo<T> = {-readonly [P in keyof T]: T[P]}", "")
expectPrintedTS(t, "type Foo<T> = {+readonly [P in keyof T]: T[P]}", "")
expectPrintedTS(t, "let x: number! = y", "let x = y;\n")
expectPrintedTS(t, "let x: number \n !y", "let x;\n!y;\n")
expectPrintedTS(t, "const x: unique = y", "const x = y;\n")
expectPrintedTS(t, "const x: unique<T> = y", "const x = y;\n")
expectPrintedTS(t, "const x: unique\nsymbol = y", "const x = y;\n")
expectPrintedTS(t, "let x: typeof a = y", "let x = y;\n")
expectPrintedTS(t, "let x: typeof a.b = y", "let x = y;\n")
expectPrintedTS(t, "let x: typeof a.if = y", "let x = y;\n")
expectPrintedTS(t, "let x: typeof if.a = y", "let x = y;\n")
expectPrintedTS(t, "let x: typeof readonly = y", "let x = y;\n")
expectParseErrorTS(t, "let x: typeof readonly Array", "<stdin>: ERROR: Expected \";\" but found \"Array\"\n")
expectPrintedTS(t, "let x: `y`", "let x;\n")
expectParseErrorTS(t, "let x: tag`y`", "<stdin>: ERROR: Expected \";\" but found \"`y`\"\n")
expectPrintedTS(t, "let x: { <A extends B>(): c.d \n <E extends F>(): g.h }", "let x;\n")
expectPrintedTSX(t, "type x = a.b \n <c></c>", "/* @__PURE__ */ React.createElement(\"c\", null);\n")
expectPrintedTS(t, "type Foo = a.b \n | c.d", "")
expectPrintedTS(t, "type Foo = a.b \n & c.d", "")
expectPrintedTS(t, "type Foo = \n | a.b \n | c.d", "")
expectPrintedTS(t, "type Foo = \n & a.b \n & c.d", "")
expectPrintedTS(t, "let x: A.B<X.Y>", "let x;\n")
expectPrintedTS(t, "let x: A.B<X.Y>=2", "let x = 2;\n")
expectPrintedTS(t, "let x: A.B<X.Y<Z>>", "let x;\n")
expectPrintedTS(t, "let x: A.B<X.Y<Z>>=2", "let x = 2;\n")
expectPrintedTS(t, "let x: A.B<X.Y<Z<T>>>", "let x;\n")
expectPrintedTS(t, "let x: A.B<X.Y<Z<T>>>=2", "let x = 2;\n")
expectPrintedTS(t, "(): A<T>=> 0", "() => 0;\n")
expectPrintedTS(t, "(): A<B<T>>=> 0", "() => 0;\n")
expectPrintedTS(t, "(): A<B<C<T>>>=> 0", "() => 0;\n")
expectPrintedTS(t, "let foo: any\n<x>y", "let foo;\ny;\n")
expectPrintedTSX(t, "let foo: any\n<x>y</x>", "let foo;\n/* @__PURE__ */ React.createElement(\"x\", null, \"y\");\n")
expectParseErrorTS(t, "let foo: (any\n<x>y)", "<stdin>: ERROR: Expected \")\" but found \"<\"\n")
expectPrintedTS(t, "let foo = bar as (null)", "let foo = bar;\n")
expectPrintedTS(t, "let foo = bar\nas (null)", "let foo = bar;\nas(null);\n")
expectParseErrorTS(t, "let foo = (bar\nas (null))", "<stdin>: ERROR: Expected \")\" but found \"as\"\n")
expectPrintedTS(t, "a as any ? b : c;", "a ? b : c;\n")
expectPrintedTS(t, "a as any ? async () => b : c;", "a ? async () => b : c;\n")
expectPrintedTS(t, "foo as number extends Object ? any : any;", "foo;\n")
expectPrintedTS(t, "foo as number extends Object ? () => void : any;", "foo;\n")
expectPrintedTS(t, "let a = b ? c : d as T extends T ? T extends T ? T : never : never ? e : f;", "let a = b ? c : d ? e : f;\n")
expectParseErrorTS(t, "type a = b extends c", "<stdin>: ERROR: Expected \"?\" but found end of file\n")
expectParseErrorTS(t, "type a = b extends c extends d", "<stdin>: ERROR: Expected \"?\" but found \"extends\"\n")
expectParseErrorTS(t, "type a = b ? c : d", "<stdin>: ERROR: Expected \";\" but found \"?\"\n")
expectPrintedTS(t, "let foo: keyof Object = 'toString'", "let foo = \"toString\";\n")
expectPrintedTS(t, "let foo: keyof\nObject = 'toString'", "let foo = \"toString\";\n")
expectPrintedTS(t, "let foo: (keyof\nObject) = 'toString'", "let foo = \"toString\";\n")
expectPrintedTS(t, "type Foo = Array<<T>(x: T) => T>\n x", "x;\n")
expectPrintedTSX(t, "<Foo<<T>(x: T) => T>/>", "/* @__PURE__ */ React.createElement(Foo, null);\n")
// Certain built-in types do not accept type parameters
expectPrintedTS(t, "x as 1 < 1", "x < 1;\n")
expectPrintedTS(t, "x as 1n < 1", "x < 1;\n")
expectPrintedTS(t, "x as -1 < 1", "x < 1;\n")
expectPrintedTS(t, "x as -1n < 1", "x < 1;\n")
expectPrintedTS(t, "x as '' < 1", "x < 1;\n")
expectPrintedTS(t, "x as `` < 1", "x < 1;\n")
expectPrintedTS(t, "x as any < 1", "x < 1;\n")
expectPrintedTS(t, "x as bigint < 1", "x < 1;\n")
expectPrintedTS(t, "x as false < 1", "x < 1;\n")
expectPrintedTS(t, "x as never < 1", "x < 1;\n")
expectPrintedTS(t, "x as null < 1", "x < 1;\n")
expectPrintedTS(t, "x as number < 1", "x < 1;\n")
expectPrintedTS(t, "x as object < 1", "x < 1;\n")
expectPrintedTS(t, "x as string < 1", "x < 1;\n")
expectPrintedTS(t, "x as symbol < 1", "x < 1;\n")
expectPrintedTS(t, "x as this < 1", "x < 1;\n")
expectPrintedTS(t, "x as true < 1", "x < 1;\n")
expectPrintedTS(t, "x as undefined < 1", "x < 1;\n")
expectPrintedTS(t, "x as unique symbol < 1", "x < 1;\n")
expectPrintedTS(t, "x as unknown < 1", "x < 1;\n")
expectPrintedTS(t, "x as void < 1", "x < 1;\n")
expectParseErrorTS(t, "x as Foo < 1", "<stdin>: ERROR: Expected \">\" but found end of file\n")
// These keywords are valid tuple labels
expectPrintedTS(t, "type _false = [false: string]", "")
expectPrintedTS(t, "type _function = [function: string]", "")
expectPrintedTS(t, "type _import = [import: string]", "")
expectPrintedTS(t, "type _new = [new: string]", "")
expectPrintedTS(t, "type _null = [null: string]", "")
expectPrintedTS(t, "type _this = [this: string]", "")
expectPrintedTS(t, "type _true = [true: string]", "")
expectPrintedTS(t, "type _typeof = [typeof: string]", "")
expectPrintedTS(t, "type _void = [void: string]", "")
// These keywords are invalid tuple labels
expectParseErrorTS(t, "type _break = [break: string]", "<stdin>: ERROR: Unexpected \"break\"\n")
expectParseErrorTS(t, "type _case = [case: string]", "<stdin>: ERROR: Unexpected \"case\"\n")
expectParseErrorTS(t, "type _catch = [catch: string]", "<stdin>: ERROR: Unexpected \"catch\"\n")
expectParseErrorTS(t, "type _class = [class: string]", "<stdin>: ERROR: Unexpected \"class\"\n")
expectParseErrorTS(t, "type _const = [const: string]", "<stdin>: ERROR: Unexpected \"const\"\n")
expectParseErrorTS(t, "type _continue = [continue: string]", "<stdin>: ERROR: Unexpected \"continue\"\n")
expectParseErrorTS(t, "type _debugger = [debugger: string]", "<stdin>: ERROR: Unexpected \"debugger\"\n")
expectParseErrorTS(t, "type _default = [default: string]", "<stdin>: ERROR: Unexpected \"default\"\n")
expectParseErrorTS(t, "type _delete = [delete: string]", "<stdin>: ERROR: Unexpected \"delete\"\n")
expectParseErrorTS(t, "type _do = [do: string]", "<stdin>: ERROR: Unexpected \"do\"\n")
expectParseErrorTS(t, "type _else = [else: string]", "<stdin>: ERROR: Unexpected \"else\"\n")
expectParseErrorTS(t, "type _enum = [enum: string]", "<stdin>: ERROR: Unexpected \"enum\"\n")
expectParseErrorTS(t, "type _export = [export: string]", "<stdin>: ERROR: Unexpected \"export\"\n")
expectParseErrorTS(t, "type _extends = [extends: string]", "<stdin>: ERROR: Unexpected \"extends\"\n")
expectParseErrorTS(t, "type _finally = [finally: string]", "<stdin>: ERROR: Unexpected \"finally\"\n")
expectParseErrorTS(t, "type _for = [for: string]", "<stdin>: ERROR: Unexpected \"for\"\n")
expectParseErrorTS(t, "type _if = [if: string]", "<stdin>: ERROR: Unexpected \"if\"\n")
expectParseErrorTS(t, "type _in = [in: string]", "<stdin>: ERROR: Unexpected \"in\"\n")
expectParseErrorTS(t, "type _instanceof = [instanceof: string]", "<stdin>: ERROR: Unexpected \"instanceof\"\n")
expectParseErrorTS(t, "type _return = [return: string]", "<stdin>: ERROR: Unexpected \"return\"\n")
expectParseErrorTS(t, "type _super = [super: string]", "<stdin>: ERROR: Unexpected \"super\"\n")
expectParseErrorTS(t, "type _switch = [switch: string]", "<stdin>: ERROR: Unexpected \"switch\"\n")
expectParseErrorTS(t, "type _throw = [throw: string]", "<stdin>: ERROR: Unexpected \"throw\"\n")
expectParseErrorTS(t, "type _try = [try: string]", "<stdin>: ERROR: Unexpected \"try\"\n")
expectParseErrorTS(t, "type _var = [var: string]", "<stdin>: ERROR: Unexpected \"var\"\n")
expectParseErrorTS(t, "type _while = [while: string]", "<stdin>: ERROR: Unexpected \"while\"\n")
expectParseErrorTS(t, "type _with = [with: string]", "<stdin>: ERROR: Unexpected \"with\"\n")
// TypeScript 4.1
expectPrintedTS(t, "let foo: `${'a' | 'b'}-${'c' | 'd'}` = 'a-c'", "let foo = \"a-c\";\n")
// TypeScript 4.2
expectPrintedTS(t, "let x: abstract new () => void = Foo", "let x = Foo;\n")
expectPrintedTS(t, "let x: abstract new <T>() => Foo<T>", "let x;\n")
expectPrintedTS(t, "let x: abstract new <T extends object>() => Foo<T>", "let x;\n")
expectParseErrorTS(t, "let x: abstract () => void = Foo", "<stdin>: ERROR: Expected \";\" but found \"(\"\n")
expectParseErrorTS(t, "let x: abstract <T>() => Foo<T>", "<stdin>: ERROR: Expected \";\" but found \"(\"\n")
expectParseErrorTS(t, "let x: abstract <T extends object>() => Foo<T>", "<stdin>: ERROR: Expected \"?\" but found \">\"\n")
// TypeScript 4.7
jsxErrorArrow := "<stdin>: ERROR: The character \">\" is not valid inside a JSX element\n" +
"NOTE: Did you mean to escape it as \"{'>'}\" instead?\n" +
"<stdin>: ERROR: Unexpected end of file\n"
expectPrintedTS(t, "type Foo<in T> = T", "")
expectPrintedTS(t, "type Foo<out T> = T", "")
expectPrintedTS(t, "type Foo<in out> = T", "")
expectPrintedTS(t, "type Foo<out out> = T", "")
expectPrintedTS(t, "type Foo<in out out> = T", "")
expectPrintedTS(t, "type Foo<in X, out Y> = [X, Y]", "")
expectPrintedTS(t, "type Foo<out X, in Y> = [X, Y]", "")
expectPrintedTS(t, "type Foo<out X, out Y extends keyof X> = [X, Y]", "")
expectParseErrorTS(t, "type Foo<i\\u006E T> = T", "<stdin>: ERROR: Expected identifier but found \"i\\\\u006E\"\n")
expectParseErrorTS(t, "type Foo<ou\\u0074 T> = T", "<stdin>: ERROR: Expected \">\" but found \"T\"\n")
expectParseErrorTS(t, "type Foo<in in> = T", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n<stdin>: ERROR: Expected identifier but found \">\"\n")
expectParseErrorTS(t, "type Foo<out in> = T", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n<stdin>: ERROR: Expected identifier but found \">\"\n")
expectParseErrorTS(t, "type Foo<out in T> = T", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "type Foo<public T> = T", "<stdin>: ERROR: Expected \">\" but found \"T\"\n")
expectParseErrorTS(t, "type Foo<in out in T> = T", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "type Foo<in out out T> = T", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectPrintedTS(t, "class Foo<in T> {}", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo<out T> {}", "class Foo {\n}\n")
expectPrintedTS(t, "export default class Foo<in T> {}", "export default class Foo {\n}\n")
expectPrintedTS(t, "export default class Foo<out T> {}", "export default class Foo {\n}\n")
expectPrintedTS(t, "export default class <in T> {}", "export default class {\n}\n")
expectPrintedTS(t, "export default class <out T> {}", "export default class {\n}\n")
expectPrintedTS(t, "interface Foo<in T> {}", "")
expectPrintedTS(t, "interface Foo<out T> {}", "")
expectPrintedTS(t, "declare class Foo<in T> {}", "")
expectPrintedTS(t, "declare class Foo<out T> {}", "")
expectPrintedTS(t, "declare interface Foo<in T> {}", "")
expectPrintedTS(t, "declare interface Foo<out T> {}", "")
expectParseErrorTS(t, "function foo<in T>() {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "function foo<out T>() {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "export default function foo<in T>() {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "export default function foo<out T>() {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "export default function <in T>() {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "export default function <out T>() {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let foo: Foo<in T>", "<stdin>: ERROR: Unexpected \"in\"\n")
expectParseErrorTS(t, "let foo: Foo<out T>", "<stdin>: ERROR: Expected \">\" but found \"T\"\n")
expectParseErrorTS(t, "declare function foo<in T>()", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "declare function foo<out T>()", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "declare let foo: Foo<in T>", "<stdin>: ERROR: Unexpected \"in\"\n")
expectParseErrorTS(t, "declare let foo: Foo<out T>", "<stdin>: ERROR: Expected \">\" but found \"T\"\n")
expectParseErrorTS(t, "Foo = class <in T> {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "Foo = class <out T> {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "foo = function <in T>() {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "foo = function <out T>() {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "class Foo { foo<in T>(): T {} }", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "class Foo { foo<out T>(): T {} }", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "foo = { foo<in T>(): T {} }", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "foo = { foo<out T>(): T {} }", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "<in T>() => {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "<out T>() => {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "<in T, out T>() => {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let x: <in T>() => {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "let x: <out T>() => {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let x: <in T, out T>() => {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let x: new <in T>() => {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "let x: new <out T>() => {}", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let x: new <in T, out T>() => {}", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let x: { y<in T>(): any }", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n")
expectParseErrorTS(t, "let x: { y<out T>(): any }", "<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectParseErrorTS(t, "let x: { y<in T, out T>(): any }", "<stdin>: ERROR: The modifier \"in\" is not valid here:\n<stdin>: ERROR: The modifier \"out\" is not valid here:\n")
expectPrintedTSX(t, "<in T></in>", "/* @__PURE__ */ React.createElement(\"in\", {\n T: true\n});\n")
expectPrintedTSX(t, "<out T></out>", "/* @__PURE__ */ React.createElement(\"out\", {\n T: true\n});\n")
expectPrintedTSX(t, "<in out T></in>", "/* @__PURE__ */ React.createElement(\"in\", {\n out: true,\n T: true\n});\n")
expectPrintedTSX(t, "<out in T></out>", "/* @__PURE__ */ React.createElement(\"out\", {\n in: true,\n T: true\n});\n")
expectPrintedTSX(t, "<in T extends={true}></in>", "/* @__PURE__ */ React.createElement(\"in\", {\n T: true,\n extends: true\n});\n")
expectPrintedTSX(t, "<out T extends={true}></out>", "/* @__PURE__ */ React.createElement(\"out\", {\n T: true,\n extends: true\n});\n")
expectPrintedTSX(t, "<in out T extends={true}></in>", "/* @__PURE__ */ React.createElement(\"in\", {\n out: true,\n T: true,\n extends: true\n});\n")
expectParseErrorTSX(t, "<in T,>() => {}", "<stdin>: ERROR: Expected \">\" but found \",\"\n")
expectParseErrorTSX(t, "<out T,>() => {}", "<stdin>: ERROR: Expected \">\" but found \",\"\n")
expectParseErrorTSX(t, "<in out T,>() => {}", "<stdin>: ERROR: Expected \">\" but found \",\"\n")
expectParseErrorTSX(t, "<in T extends any>() => {}", jsxErrorArrow)
expectParseErrorTSX(t, "<out T extends any>() => {}", jsxErrorArrow)
expectParseErrorTSX(t, "<in out T extends any>() => {}", jsxErrorArrow)
expectPrintedTS(t, "class Container { get data(): typeof this.#data {} }", "class Container {\n get data() {\n }\n}\n")
expectPrintedTS(t, "const a: typeof this.#a = 1;", "const a = 1;\n")
expectParseErrorTS(t, "const a: typeof #a = 1;", "<stdin>: ERROR: Expected identifier but found \"#a\"\n")
}
func TestTSAsCast(t *testing.T) {
expectPrintedTS(t, "x as any\n(y);", "x;\ny;\n")
expectPrintedTS(t, "x as any\n`y`;", "x;\n`y`;\n")
expectPrintedTS(t, "x as any\n`${y}`;", "x;\n`${y}`;\n")
expectPrintedTS(t, "x as any\n--y;", "x;\n--y;\n")
expectPrintedTS(t, "x as any\n++y;", "x;\n++y;\n")
expectPrintedTS(t, "x + y as any\n(z as any) + 1;", "x + y;\nz + 1;\n")
expectPrintedTS(t, "x + y as any\n(z as any) = 1;", "x + y;\nz = 1;\n")
expectPrintedTS(t, "x = y as any\n(z as any) + 1;", "x = y;\nz + 1;\n")
expectPrintedTS(t, "x = y as any\n(z as any) = 1;", "x = y;\nz = 1;\n")
expectPrintedTS(t, "x * y as any\n['z'];", "x * y;\n[\"z\"];\n")
expectPrintedTS(t, "x * y as any\n.z;", "x * y;\n")
expectPrintedTS(t, "x as y['x'];", "x;\n")
expectPrintedTS(t, "x as y!['x'];", "x;\n")
expectPrintedTS(t, "x as y\n['x'];", "x;\n[\"x\"];\n")
expectPrintedTS(t, "x as y\n!['x'];", "x;\n![\"x\"];\n")
expectParseErrorTS(t, "x = y as any `z`;", "<stdin>: ERROR: Expected \";\" but found \"`z`\"\n")
expectParseErrorTS(t, "x = y as any `${z}`;", "<stdin>: ERROR: Expected \";\" but found \"`${\"\n")
expectParseErrorTS(t, "x = y as any?.z;", "<stdin>: ERROR: Expected \";\" but found \"?.\"\n")
expectParseErrorTS(t, "x = y as any--;", "<stdin>: ERROR: Expected \";\" but found \"--\"\n")
expectParseErrorTS(t, "x = y as any++;", "<stdin>: ERROR: Expected \";\" but found \"++\"\n")
expectParseErrorTS(t, "x = y as any(z);", "<stdin>: ERROR: Expected \";\" but found \"(\"\n")
expectParseErrorTS(t, "x = y as any\n= z;", "<stdin>: ERROR: Unexpected \"=\"\n")
expectParseErrorTS(t, "a, x as y `z`;", "<stdin>: ERROR: Expected \";\" but found \"`z`\"\n")
expectParseErrorTS(t, "a ? b : x as y `z`;", "<stdin>: ERROR: Expected \";\" but found \"`z`\"\n")
expectParseErrorTS(t, "x as any = y;", "<stdin>: ERROR: Expected \";\" but found \"=\"\n")
expectParseErrorTS(t, "(x as any = y);", "<stdin>: ERROR: Expected \")\" but found \"=\"\n")
expectParseErrorTS(t, "(x = y as any(z));", "<stdin>: ERROR: Expected \")\" but found \"(\"\n")
}
func TestTSClass(t *testing.T) {
expectPrintedTS(t, "export default class Foo {}", "export default class Foo {\n}\n")
expectPrintedTS(t, "export default class Foo extends Bar<T> {}", "export default class Foo extends Bar {\n}\n")
expectPrintedTS(t, "export default class Foo extends Bar<T>() {}", "export default class Foo extends Bar() {\n}\n")
expectPrintedTS(t, "export default class Foo implements Bar<T> {}", "export default class Foo {\n}\n")
expectPrintedTS(t, "export default class Foo<T> {}", "export default class Foo {\n}\n")
expectPrintedTS(t, "export default class Foo<T> extends Bar<T> {}", "export default class Foo extends Bar {\n}\n")
expectPrintedTS(t, "export default class Foo<T> extends Bar<T>() {}", "export default class Foo extends Bar() {\n}\n")
expectPrintedTS(t, "export default class Foo<T> implements Bar<T> {}", "export default class Foo {\n}\n")
expectPrintedTS(t, "(class Foo<T> {})", "(class Foo {\n});\n")
expectPrintedTS(t, "(class Foo<T> extends Bar<T> {})", "(class Foo extends Bar {\n});\n")
expectPrintedTS(t, "(class Foo<T> extends Bar<T>() {})", "(class Foo extends Bar() {\n});\n")
expectPrintedTS(t, "(class Foo<T> implements Bar<T> {})", "(class Foo {\n});\n")
expectPrintedTS(t, "export default class {}", "export default class {\n}\n")
expectPrintedTS(t, "export default class extends Foo<T> {}", "export default class extends Foo {\n}\n")
expectPrintedTS(t, "export default class implements Foo<T> {}", "export default class {\n}\n")
expectPrintedTS(t, "export default class <T> {}", "export default class {\n}\n")
expectPrintedTS(t, "export default class <T> extends Foo<T> {}", "export default class extends Foo {\n}\n")
expectPrintedTS(t, "export default class <T> implements Foo<T> {}", "export default class {\n}\n")
expectPrintedTS(t, "(class <T> {})", "(class {\n});\n")
expectPrintedTS(t, "(class extends Foo<T> {})", "(class extends Foo {\n});\n")
expectPrintedTS(t, "(class extends Foo<T>() {})", "(class extends Foo() {\n});\n")
expectPrintedTS(t, "(class implements Foo<T> {})", "(class {\n});\n")
expectPrintedTS(t, "(class <T> extends Foo<T> {})", "(class extends Foo {\n});\n")
expectPrintedTS(t, "(class <T> extends Foo<T>() {})", "(class extends Foo() {\n});\n")
expectPrintedTS(t, "(class <T> implements Foo<T> {})", "(class {\n});\n")
expectPrintedTS(t, "abstract class A { abstract foo(): void; bar(): void {} }", "class A {\n bar() {\n }\n}\n")
expectPrintedTS(t, "export abstract class A { abstract foo(): void; bar(): void {} }", "export class A {\n bar() {\n }\n}\n")
expectPrintedTS(t, "export default abstract", "export default abstract;\n")
expectPrintedTS(t, "export default abstract - after", "export default abstract - after;\n")
expectPrintedTS(t, "export default abstract class { abstract foo(): void; bar(): void {} } - after", "export default class {\n bar() {\n }\n}\n-after;\n")
expectPrintedTS(t, "export default abstract class A { abstract foo(): void; bar(): void {} } - after", "export default class A {\n bar() {\n }\n}\n-after;\n")
expectPrintedTS(t, "class A<T extends number> extends B.C<D, E> {}", "class A extends B.C {\n}\n")
expectPrintedTS(t, "class A<T extends number> implements B.C<D, E>, F.G<H, I> {}", "class A {\n}\n")
expectPrintedTS(t, "class A<T extends number> extends X implements B.C<D, E>, F.G<H, I> {}", "class A extends X {\n}\n")
reservedWordError :=
" is a reserved word and cannot be used in strict mode\n" +
"<stdin>: NOTE: All code inside a class is implicitly in strict mode\n"
expectParseErrorTS(t, "class Foo { constructor(public) {} }", "<stdin>: ERROR: \"public\""+reservedWordError)
expectParseErrorTS(t, "class Foo { constructor(protected) {} }", "<stdin>: ERROR: \"protected\""+reservedWordError)
expectParseErrorTS(t, "class Foo { constructor(private) {} }", "<stdin>: ERROR: \"private\""+reservedWordError)
expectPrintedTS(t, "class Foo { constructor(readonly) {} }", "class Foo {\n constructor(readonly) {\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(override) {} }", "class Foo {\n constructor(override) {\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(public x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(protected x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(private x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(readonly x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(override x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(public readonly x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(protected readonly x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(private readonly x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectPrintedTS(t, "class Foo { constructor(override readonly x) {} }", "class Foo {\n constructor(x) {\n this.x = x;\n }\n}\n")
expectParseErrorTS(t, "class Foo { constructor(public {x}) {} }", "<stdin>: ERROR: Expected identifier but found \"{\"\n")
expectParseErrorTS(t, "class Foo { constructor(protected {x}) {} }", "<stdin>: ERROR: Expected identifier but found \"{\"\n")
expectParseErrorTS(t, "class Foo { constructor(private {x}) {} }", "<stdin>: ERROR: Expected identifier but found \"{\"\n")
expectParseErrorTS(t, "class Foo { constructor(readonly {x}) {} }", "<stdin>: ERROR: Expected identifier but found \"{\"\n")
expectParseErrorTS(t, "class Foo { constructor(override {x}) {} }", "<stdin>: ERROR: Expected identifier but found \"{\"\n")
expectParseErrorTS(t, "class Foo { constructor(public [x]) {} }", "<stdin>: ERROR: Expected identifier but found \"[\"\n")
expectParseErrorTS(t, "class Foo { constructor(protected [x]) {} }", "<stdin>: ERROR: Expected identifier but found \"[\"\n")
expectParseErrorTS(t, "class Foo { constructor(private [x]) {} }", "<stdin>: ERROR: Expected identifier but found \"[\"\n")
expectParseErrorTS(t, "class Foo { constructor(readonly [x]) {} }", "<stdin>: ERROR: Expected identifier but found \"[\"\n")
expectParseErrorTS(t, "class Foo { constructor(override [x]) {} }", "<stdin>: ERROR: Expected identifier but found \"[\"\n")
expectPrintedTS(t, "class Foo { foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { foo: number = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { foo(): void {} }", "class Foo {\n foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { foo(): void; foo(): void {} }", "class Foo {\n foo() {\n }\n}\n")
expectParseErrorTS(t, "class Foo { foo(): void foo(): void {} }", "<stdin>: ERROR: Expected \";\" but found \"foo\"\n")
expectPrintedTS(t, "class Foo { foo?: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { foo?: number = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { foo?(): void {} }", "class Foo {\n foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { foo?(): void; foo(): void {} }", "class Foo {\n foo() {\n }\n}\n")
expectParseErrorTS(t, "class Foo { foo?(): void foo(): void {} }", "<stdin>: ERROR: Expected \";\" but found \"foo\"\n")
expectPrintedTS(t, "class Foo { foo!: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { foo!: number = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { foo!(): void {} }", "class Foo {\n foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { foo!(): void; foo(): void {} }", "class Foo {\n foo() {\n }\n}\n")
expectParseErrorTS(t, "class Foo { foo!(): void foo(): void {} }", "<stdin>: ERROR: Expected \";\" but found \"foo\"\n")
expectPrintedTS(t, "class Foo { 'foo' = 0 }", "class Foo {\n constructor() {\n this[\"foo\"] = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { ['foo'] = 0 }", "class Foo {\n constructor() {\n this[\"foo\"] = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { [foo] = 0 }", "var _a;\nclass Foo {\n constructor() {\n this[_a] = 0;\n }\n}\n_a = foo;\n")
expectPrintedMangleTS(t, "class Foo { 'foo' = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectPrintedMangleTS(t, "class Foo { ['foo'] = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { foo \n ?: number }", "class Foo {\n}\n")
expectParseErrorTS(t, "class Foo { foo \n !: number }", "<stdin>: ERROR: Expected identifier but found \"!\"\n")
expectPrintedTS(t, "class Foo { public foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { private foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { protected foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { declare foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { declare public foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { public declare foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { override foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { override public foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { public override foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { declare override public foo: number }", "class Foo {\n}\n")
expectParseErrorTS(t, "class Foo { declare foo = 123 }", "<stdin>: ERROR: Class fields that use \"declare\" cannot be initialized\n")
expectPrintedTS(t, "class Foo { public static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { private static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { protected static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { declare static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { declare public static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { public declare static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { public static declare foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { override static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { override public static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { public override static foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { public static override foo: number }", "class Foo {\n}\n")
expectPrintedTS(t, "class Foo { declare override public static foo: number }", "class Foo {\n}\n")
expectParseErrorTS(t, "class Foo { declare static foo = 123 }", "<stdin>: ERROR: Class fields that use \"declare\" cannot be initialized\n")
expectParseErrorTS(t, "class Foo { static declare foo = 123 }", "<stdin>: ERROR: Class fields that use \"declare\" cannot be initialized\n")
expectParseErrorTS(t, "class Foo { declare #foo }", "<stdin>: ERROR: \"declare\" cannot be used with a private identifier\n")
expectParseErrorTS(t, "class Foo { declare [foo: string]: number }", "<stdin>: ERROR: \"declare\" cannot be used with an index signature\n")
expectParseErrorTS(t, "class Foo { declare foo() }", "<stdin>: ERROR: \"declare\" cannot be used with a method\n")
expectParseErrorTS(t, "class Foo { declare get foo() }", "<stdin>: ERROR: \"declare\" cannot be used with a getter\n")
expectParseErrorTS(t, "class Foo { declare set foo(x) }", "<stdin>: ERROR: \"declare\" cannot be used with a setter\n")
expectParseErrorTS(t, "class Foo { declare static #foo }", "<stdin>: ERROR: \"declare\" cannot be used with a private identifier\n")
expectParseErrorTS(t, "class Foo { declare static [foo: string]: number }", "<stdin>: ERROR: \"declare\" cannot be used with an index signature\n")
expectParseErrorTS(t, "class Foo { declare static foo() }", "<stdin>: ERROR: \"declare\" cannot be used with a method\n")
expectParseErrorTS(t, "class Foo { declare static get foo() }", "<stdin>: ERROR: \"declare\" cannot be used with a getter\n")
expectParseErrorTS(t, "class Foo { declare static set foo(x) }", "<stdin>: ERROR: \"declare\" cannot be used with a setter\n")
expectParseErrorTS(t, "class Foo { static declare #foo }", "<stdin>: ERROR: \"declare\" cannot be used with a private identifier\n")
expectParseErrorTS(t, "class Foo { static declare [foo: string]: number }", "<stdin>: ERROR: \"declare\" cannot be used with an index signature\n")
expectParseErrorTS(t, "class Foo { static declare foo() }", "<stdin>: ERROR: \"declare\" cannot be used with a method\n")
expectParseErrorTS(t, "class Foo { static declare get foo() }", "<stdin>: ERROR: \"declare\" cannot be used with a getter\n")
expectParseErrorTS(t, "class Foo { static declare set foo(x) }", "<stdin>: ERROR: \"declare\" cannot be used with a setter\n")
expectPrintedTS(t, "class Foo { [key: string]: any\nfoo = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectPrintedTS(t, "class Foo { [key: string]: any; foo = 0 }", "class Foo {\n constructor() {\n this.foo = 0;\n }\n}\n")
expectParseErrorTS(t, "class Foo<> {}", "<stdin>: ERROR: Expected identifier but found \">\"\n")
expectParseErrorTS(t, "class Foo<,> {}", "<stdin>: ERROR: Expected identifier but found \",\"\n")
expectParseErrorTS(t, "class Foo<T><T> {}", "<stdin>: ERROR: Expected \"{\" but found \"<\"\n")
}
func TestTSPrivateIdentifiers(t *testing.T) {
// The TypeScript compiler still moves private field initializers into the
// constructor, but it has to leave the private field declaration in place so
// the private field is still declared.
expectPrintedTS(t, "class Foo { #foo }", "class Foo {\n #foo;\n}\n")
expectPrintedTS(t, "class Foo { #foo = 1 }", "class Foo {\n #foo = 1;\n}\n")
expectPrintedTS(t, "class Foo { #foo() {} }", "class Foo {\n #foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { get #foo() {} }", "class Foo {\n get #foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { set #foo(x) {} }", "class Foo {\n set #foo(x) {\n }\n}\n")
// The TypeScript compiler doesn't currently support static private fields
// because it moves static field initializers to after the class body and
// private fields can't be used outside the class body. It remains to be seen
// how the TypeScript compiler will transform private static fields once it
// finally does support them. For now just leave the initializer in place.
expectPrintedTS(t, "class Foo { static #foo }", "class Foo {\n static #foo;\n}\n")
expectPrintedTS(t, "class Foo { static #foo = 1 }", "class Foo {\n static #foo = 1;\n}\n")
expectPrintedTS(t, "class Foo { static #foo() {} }", "class Foo {\n static #foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { static get #foo() {} }", "class Foo {\n static get #foo() {\n }\n}\n")
expectPrintedTS(t, "class Foo { static set #foo(x) {} }", "class Foo {\n static set #foo(x) {\n }\n}\n")
// Decorators are not valid on private members
expectParseErrorTS(t, "class Foo { @dec #foo }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec #foo = 1 }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec #foo() {} }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec get #foo() {} }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec set #foo() {x} }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec static #foo }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec static #foo = 1 }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec static #foo() {} }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec static get #foo() {} }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
expectParseErrorTS(t, "class Foo { @dec static set #foo() {x} }", "<stdin>: ERROR: Expected identifier but found \"#foo\"\n")
// Decorators are not able to access private names, since they use the scope
// that encloses the class declaration. Note that the TypeScript compiler has
// a bug where it doesn't handle this case and generates invalid code as a
// result: https://github.com/microsoft/TypeScript/issues/48515.
expectParseErrorTS(t, "class Foo { static #foo; @dec(Foo.#foo) bar }", "<stdin>: ERROR: Private name \"#foo\" must be declared in an enclosing class\n")
expectParseErrorTS(t, "class Foo { static #foo; @dec(Foo.#foo) bar() {} }", "<stdin>: ERROR: Private name \"#foo\" must be declared in an enclosing class\n")
expectParseErrorTS(t, "class Foo { static #foo; bar(@dec(Foo.#foo) x) {} }", "<stdin>: ERROR: Private name \"#foo\" must be declared in an enclosing class\n")
}
func TestTSInterface(t *testing.T) {
expectPrintedTS(t, "interface A { a } x", "x;\n")
expectPrintedTS(t, "interface A { a; b } x", "x;\n")
expectPrintedTS(t, "interface A { a() } x", "x;\n")
expectPrintedTS(t, "interface A { a(); b } x", "x;\n")
expectPrintedTS(t, "interface Foo { foo(): Foo \n is: Bar } x", "x;\n")
expectPrintedTS(t, "interface A<T extends number> extends B.C<D, E>, F.G<H, I> {} x", "x;\n")
expectPrintedTS(t, "export interface A<T extends number> extends B.C<D, E>, F.G<H, I> {} x", "x;\n")
expectPrintedTS(t, "export default interface Foo {} x", "x;\n")
}
func TestTSNamespace(t *testing.T) {
// Check ES5 emit
expectPrintedTargetTS(t, 5, "namespace x { export var y = 1 }", "var x;\n(function(x) {\n x.y = 1;\n})(x || (x = {}));\n")
expectPrintedTargetTS(t, 2015, "namespace x { export var y = 1 }", "var x;\n((x) => {\n x.y = 1;\n})(x || (x = {}));\n")
// Certain syntax isn't allowed inside a namespace block
expectParseErrorTS(t, "namespace x { return }", "<stdin>: ERROR: A return statement cannot be used here:\n")
expectParseErrorTS(t, "namespace x { await 1 }", "<stdin>: ERROR: \"await\" can only be used inside an \"async\" function\n")
expectParseErrorTS(t, "namespace x { if (y) return }", "<stdin>: ERROR: A return statement cannot be used here:\n")
expectParseErrorTS(t, "namespace x { if (y) await 1 }", "<stdin>: ERROR: \"await\" can only be used inside an \"async\" function\n")
expectParseErrorTS(t, "namespace x { this }", "<stdin>: ERROR: Cannot use \"this\" here:\n")
expectParseErrorTS(t, "namespace x { () => this }", "<stdin>: ERROR: Cannot use \"this\" here:\n")
expectParseErrorTS(t, "namespace x { class y { [this] } }", "<stdin>: ERROR: Cannot use \"this\" here:\n")
expectParseErrorTS(t, "namespace x { (function() { this }) }", "")
expectParseErrorTS(t, "namespace x { function y() { this } }", "")
expectParseErrorTS(t, "namespace x { class y { x = this } }", "")
expectParseErrorTS(t, "export namespace x { export let yield = 1 }",
"<stdin>: ERROR: \"yield\" is a reserved word and cannot be used in an ECMAScript module\n"+
"<stdin>: NOTE: This file is considered to be an ECMAScript module because of the \"export\" keyword here:\n")
expectPrintedTS(t, "namespace x { export let await = 1, y = await }", `var x;
((x) => {
x.await = 1;
x.y = x.await;
})(x || (x = {}));
`)
expectPrintedTS(t, "namespace x { export let yield = 1, y = yield }", `var x;
((x) => {
x.yield = 1;
x.y = x.yield;
})(x || (x = {}));
`)
expectPrintedTS(t, "namespace Foo { 0 }", `var Foo;
((Foo) => {
0;
})(Foo || (Foo = {}));
`)
expectPrintedTS(t, "export namespace Foo { 0 }", `export var Foo;
((Foo) => {
0;
})(Foo || (Foo = {}));
`)
// Namespaces should introduce a scope that prevents name collisions
expectPrintedTS(t, "namespace Foo { let x } let x", `var Foo;
((Foo) => {
let x;
})(Foo || (Foo = {}));
let x;
`)
// Exports in namespaces shouldn't collide with module exports
expectPrintedTS(t, "namespace Foo { export let x } export let x", `var Foo;
((Foo) => {
})(Foo || (Foo = {}));
export let x;
`)
expectPrintedTS(t, "declare namespace Foo { export let x } namespace x { 0 }", `var x;
((x) => {
0;
})(x || (x = {}));
`)
errorText := `<stdin>: ERROR: The symbol "foo" has already been declared
<stdin>: NOTE: The symbol "foo" was originally declared here:
`
// Namespaces with values are not allowed to merge
expectParseErrorTS(t, "var foo; namespace foo { 0 }", errorText)
expectParseErrorTS(t, "let foo; namespace foo { 0 }", errorText)
expectParseErrorTS(t, "const foo = 0; namespace foo { 0 }", errorText)
expectParseErrorTS(t, "namespace foo { 0 } var foo", errorText)
expectParseErrorTS(t, "namespace foo { 0 } let foo", errorText)
expectParseErrorTS(t, "namespace foo { 0 } const foo = 0", errorText)
// Namespaces without values are allowed to merge
expectPrintedTS(t, "var foo; namespace foo {}", "var foo;\n")
expectPrintedTS(t, "let foo; namespace foo {}", "let foo;\n")
expectPrintedTS(t, "const foo = 0; namespace foo {}", "const foo = 0;\n")
expectPrintedTS(t, "namespace foo {} var foo", "var foo;\n")
expectPrintedTS(t, "namespace foo {} let foo", "let foo;\n")
expectPrintedTS(t, "namespace foo {} const foo = 0", "const foo = 0;\n")
// Namespaces with types but no values are allowed to merge
expectPrintedTS(t, "var foo; namespace foo { export type bar = number }", "var foo;\n")
expectPrintedTS(t, "let foo; namespace foo { export type bar = number }", "let foo;\n")
expectPrintedTS(t, "const foo = 0; namespace foo { export type bar = number }", "const foo = 0;\n")
expectPrintedTS(t, "namespace foo { export type bar = number } var foo", "var foo;\n")
expectPrintedTS(t, "namespace foo { export type bar = number } let foo", "let foo;\n")
expectPrintedTS(t, "namespace foo { export type bar = number } const foo = 0", "const foo = 0;\n")
// Namespaces are allowed to merge with certain symbols
expectPrintedTS(t, "function foo() {} namespace foo { 0 }", `function foo() {
}
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "function* foo() {} namespace foo { 0 }", `function* foo() {
}
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "async function foo() {} namespace foo { 0 }", `async function foo() {
}
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "class foo {} namespace foo { 0 }", `class foo {
}
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "enum foo { a } namespace foo { 0 }", `var foo = /* @__PURE__ */ ((foo) => {
foo[foo["a"] = 0] = "a";
return foo;
})(foo || {});
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "namespace foo {} namespace foo { 0 }", `var foo;
((foo) => {
0;
})(foo || (foo = {}));
`)
expectParseErrorTS(t, "namespace foo { 0 } function foo() {}", errorText)
expectParseErrorTS(t, "namespace foo { 0 } function* foo() {}", errorText)
expectParseErrorTS(t, "namespace foo { 0 } async function foo() {}", errorText)
expectParseErrorTS(t, "namespace foo { 0 } class foo {}", errorText)
expectPrintedTS(t, "namespace foo { 0 } enum foo { a }", `var foo;
((foo) => {
0;
})(foo || (foo = {}));
var foo = /* @__PURE__ */ ((foo) => {
foo[foo["a"] = 0] = "a";
return foo;
})(foo || {});
`)
expectPrintedTS(t, "namespace foo { 0 } namespace foo {}", `var foo;
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "namespace foo { 0 } namespace foo { 0 }", `var foo;
((foo) => {
0;
})(foo || (foo = {}));
((foo) => {
0;
})(foo || (foo = {}));
`)
expectPrintedTS(t, "function foo() {} namespace foo { 0 } function foo() {}", `function foo() {
}
((foo) => {
0;
})(foo || (foo = {}));
function foo() {
}
`)
expectPrintedTS(t, "function* foo() {} namespace foo { 0 } function* foo() {}", `function* foo() {
}
((foo) => {
0;
})(foo || (foo = {}));
function* foo() {
}
`)
expectPrintedTS(t, "async function foo() {} namespace foo { 0 } async function foo() {}", `async function foo() {
}
((foo) => {
0;
})(foo || (foo = {}));
async function foo() {
}
`)
// Namespace merging shouldn't allow for other merging
expectParseErrorTS(t, "class foo {} namespace foo { 0 } class foo {}", errorText)
expectParseErrorTS(t, "class foo {} namespace foo { 0 } enum foo {}", errorText)
expectParseErrorTS(t, "enum foo {} namespace foo { 0 } class foo {}", errorText)
expectParseErrorTS(t, "namespace foo { 0 } namespace foo { 0 } let foo", errorText)
expectParseErrorTS(t, "namespace foo { 0 } enum foo {} class foo {}", errorText)
// Test dot nested namespace syntax
expectPrintedTS(t, "namespace foo.bar { foo(bar) }", `var foo;
((foo) => {
let bar;
((bar) => {
foo(bar);
})(bar = foo.bar || (foo.bar = {}));
})(foo || (foo = {}));
`)
// "module" is a deprecated alias for "namespace"
expectPrintedTS(t, "module foo { export namespace bar { foo(bar) } }", `var foo;
((foo) => {
let bar;
((bar) => {
foo(bar);
})(bar = foo.bar || (foo.bar = {}));
})(foo || (foo = {}));
`)
expectPrintedTS(t, "namespace foo { export module bar { foo(bar) } }", `var foo;
((foo) => {
let bar;
((bar) => {
foo(bar);
})(bar = foo.bar || (foo.bar = {}));
})(foo || (foo = {}));
`)
expectPrintedTS(t, "module foo.bar { foo(bar) }", `var foo;
((foo) => {
let bar;
((bar) => {
foo(bar);
})(bar = foo.bar || (foo.bar = {}));
})(foo || (foo = {}));
`)
}
func TestTSNamespaceExports(t *testing.T) {
expectPrintedTS(t, `
namespace A {
export namespace B {
export function fn() {}
}
namespace C {
export function fn() {}
}
namespace D {
function fn() {}
}
}
`, `var A;
((A) => {
let B;
((B) => {
function fn() {
}
B.fn = fn;
})(B = A.B || (A.B = {}));
let C;
((C) => {
function fn() {
}
C.fn = fn;
})(C || (C = {}));
let D;
((D) => {
function fn() {
}
})(D || (D = {}));
})(A || (A = {}));
`)
expectPrintedTS(t, `
namespace A {
export namespace B {
export class Class {}
}
namespace C {
export class Class {}
}
namespace D {
class Class {}
}
}
`, `var A;
((A) => {
let B;
((B) => {
class Class {
}
B.Class = Class;
})(B = A.B || (A.B = {}));
let C;
((C) => {
class Class {
}
C.Class = Class;
})(C || (C = {}));
let D;
((D) => {
class Class {
}
})(D || (D = {}));
})(A || (A = {}));
`)
expectPrintedTS(t, `
namespace A {
export namespace B {
export enum Enum {}
}
namespace C {
export enum Enum {}
}
namespace D {
enum Enum {}
}
}
`, `var A;
((A) => {
let B;
((B) => {
let Enum;
((Enum) => {
})(Enum = B.Enum || (B.Enum = {}));
})(B = A.B || (A.B = {}));
let C;
((C) => {
let Enum;
((Enum) => {
})(Enum = C.Enum || (C.Enum = {}));
})(C || (C = {}));
let D;
((D) => {
let Enum;
((Enum) => {
})(Enum || (Enum = {}));
})(D || (D = {}));
})(A || (A = {}));
`)
expectPrintedTS(t, `
namespace A {
export namespace B {
export let foo = 1
foo += foo
}
namespace C {
export let foo = 1
foo += foo
}
namespace D {
let foo = 1
foo += foo
}
}
`, `var A;
((A) => {
let B;
((B) => {
B.foo = 1;
B.foo += B.foo;
})(B = A.B || (A.B = {}));
let C;
((C) => {
C.foo = 1;
C.foo += C.foo;
})(C || (C = {}));
let D;
((D) => {
let foo = 1;
foo += foo;
})(D || (D = {}));
})(A || (A = {}));
`)
expectPrintedTS(t, `
namespace A {
export namespace B {
export const foo = 1
}
namespace C {
export const foo = 1
}
namespace D {
const foo = 1
}
}
`, `var A;
((A) => {
let B;
((B) => {
B.foo = 1;
})(B = A.B || (A.B = {}));
let C;
((C) => {
C.foo = 1;
})(C || (C = {}));
let D;
((D) => {
const foo = 1;
})(D || (D = {}));
})(A || (A = {}));
`)
expectPrintedTS(t, `
namespace A {
export namespace B {