forked from babel/babel
/
index.js
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/
index.js
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import Printer from "../lib/printer";
import generate, { CodeGenerator } from "../lib";
import { parse } from "@babel/parser";
import * as t from "@babel/types";
import fs from "fs";
import path from "path";
import fixtures from "@babel/helper-fixtures";
describe("generation", function() {
it("completeness", function() {
Object.keys(t.VISITOR_KEYS).forEach(function(type) {
expect(Printer.prototype[type]).toBeTruthy();
});
Object.keys(Printer.prototype).forEach(function(type) {
if (!/[A-Z]/.test(type[0])) return;
expect(t.VISITOR_KEYS[type]).toBeTruthy();
});
});
it("multiple sources", function() {
const sources = {
"a.js": "function hi (msg) { console.log(msg); }\n",
"b.js": "hi('hello');\n",
};
const parsed = Object.keys(sources).reduce(function(_parsed, filename) {
_parsed[filename] = parse(sources[filename], {
sourceFilename: filename,
});
return _parsed;
}, {});
const combinedAst = {
type: "File",
program: {
type: "Program",
sourceType: "module",
body: [].concat(
parsed["a.js"].program.body,
parsed["b.js"].program.body,
),
},
};
const generated = generate(combinedAst, { sourceMaps: true }, sources);
expect(generated.map).toEqual(
{
version: 3,
sources: ["a.js", "b.js"],
mappings:
// eslint-disable-next-line max-len
"AAAA,SAASA,EAAT,CAAaC,GAAb,EAAkB;AAAEC,EAAAA,OAAO,CAACC,GAAR,CAAYF,GAAZ;AAAmB;;ACAvCD,EAAE,CAAC,OAAD,CAAF",
names: ["hi", "msg", "console", "log"],
sourcesContent: [
"function hi (msg) { console.log(msg); }\n",
"hi('hello');\n",
],
},
"sourcemap was incorrectly generated",
);
expect(generated.rawMappings).toEqual(
[
{
name: undefined,
generated: { line: 1, column: 0 },
source: "a.js",
original: { line: 1, column: 0 },
},
{
name: "hi",
generated: { line: 1, column: 9 },
source: "a.js",
original: { line: 1, column: 9 },
},
{
name: undefined,
generated: { line: 1, column: 11 },
source: "a.js",
original: { line: 1, column: 0 },
},
{
name: "msg",
generated: { line: 1, column: 12 },
source: "a.js",
original: { line: 1, column: 13 },
},
{
name: undefined,
generated: { line: 1, column: 15 },
source: "a.js",
original: { line: 1, column: 0 },
},
{
name: undefined,
generated: { line: 1, column: 17 },
source: "a.js",
original: { line: 1, column: 18 },
},
{
name: "console",
generated: { line: 2, column: 0 },
source: "a.js",
original: { line: 1, column: 20 },
},
{
name: "console",
generated: { line: 2, column: 2 },
source: "a.js",
original: { line: 1, column: 20 },
},
{
name: undefined,
generated: { line: 2, column: 9 },
source: "a.js",
original: { line: 1, column: 27 },
},
{
name: "log",
generated: { line: 2, column: 10 },
source: "a.js",
original: { line: 1, column: 28 },
},
{
name: undefined,
generated: { line: 2, column: 13 },
source: "a.js",
original: { line: 1, column: 20 },
},
{
name: "msg",
generated: { line: 2, column: 14 },
source: "a.js",
original: { line: 1, column: 32 },
},
{
name: undefined,
generated: { line: 2, column: 17 },
source: "a.js",
original: { line: 1, column: 20 },
},
{
name: undefined,
generated: { line: 3, column: 0 },
source: "a.js",
original: { line: 1, column: 39 },
},
{
name: "hi",
generated: { line: 5, column: 0 },
source: "b.js",
original: { line: 1, column: 0 },
},
{
name: undefined,
generated: { line: 5, column: 2 },
source: "b.js",
original: { line: 1, column: 2 },
},
{
name: undefined,
generated: { line: 5, column: 3 },
source: "b.js",
original: { line: 1, column: 3 },
},
{
name: undefined,
generated: { line: 5, column: 10 },
source: "b.js",
original: { line: 1, column: 2 },
},
{
name: undefined,
generated: { line: 5, column: 11 },
source: "b.js",
original: { line: 1, column: 0 },
},
],
"raw mappings were incorrectly generated",
);
expect(generated.code).toBe(
"function hi(msg) {\n console.log(msg);\n}\n\nhi('hello');",
);
});
it("identifierName", function() {
const code = "function foo() { bar; }\n";
const ast = parse(code, { filename: "inline" }).program;
const fn = ast.body[0];
const id = fn.id;
id.name += "2";
id.loc.identifierName = "foo";
const id2 = fn.body.body[0].expression;
id2.name += "2";
id2.loc.identiferName = "bar";
const generated = generate(
ast,
{
filename: "inline",
sourceFileName: "inline",
sourceMaps: true,
},
code,
);
expect(generated.map).toEqual(
{
version: 3,
sources: ["inline"],
names: ["foo", "bar"],
mappings: "AAAA,SAASA,IAAT,GAAe;AAAEC,EAAAA,IAAG;AAAG",
sourcesContent: ["function foo() { bar; }\n"],
},
"sourcemap was incorrectly generated",
);
expect(generated.rawMappings).toEqual(
[
{
name: undefined,
generated: { line: 1, column: 0 },
source: "inline",
original: { line: 1, column: 0 },
},
{
name: "foo",
generated: { line: 1, column: 9 },
source: "inline",
original: { line: 1, column: 9 },
},
{
name: undefined,
generated: { line: 1, column: 13 },
source: "inline",
original: { line: 1, column: 0 },
},
{
name: undefined,
generated: { line: 1, column: 16 },
source: "inline",
original: { line: 1, column: 15 },
},
{
name: "bar",
generated: { line: 2, column: 0 },
source: "inline",
original: { line: 1, column: 17 },
},
{
name: "bar",
generated: { line: 2, column: 2 },
source: "inline",
original: { line: 1, column: 17 },
},
{
name: undefined,
generated: { line: 2, column: 6 },
source: "inline",
original: { line: 1, column: 20 },
},
{
name: undefined,
generated: { line: 3, column: 0 },
source: "inline",
original: { line: 1, column: 23 },
},
],
"raw mappings were incorrectly generated",
);
expect(generated.code).toBe("function foo2() {\n bar2;\n}");
});
it("lazy source map generation", function() {
const code = "function hi (msg) { console.log(msg); }\n";
const ast = parse(code, { filename: "a.js" }).program;
const generated = generate(ast, {
sourceFileName: "a.js",
sourceMaps: true,
});
expect(Array.isArray(generated.rawMappings)).toBe(true);
expect(
Object.getOwnPropertyDescriptor(generated, "map"),
).not.toHaveProperty("value");
expect(generated).toHaveProperty("map");
expect(typeof generated.map).toBe("object");
});
});
describe("programmatic generation", function() {
it("should add parenthesis when NullishCoalescing is used along with ||", function() {
// https://github.com/babel/babel/issues/10260
const nullishCoalesc = t.logicalExpression(
"??",
t.logicalExpression("||", t.identifier("a"), t.identifier("b")),
t.identifier("c"),
);
const output = generate(nullishCoalesc).code;
expect(output).toBe(`(a || b) ?? c`);
});
it("should add parenthesis when NullishCoalesing is used with &&", function() {
const nullishCoalesc = t.logicalExpression(
"??",
t.identifier("a"),
t.logicalExpression(
"&&",
t.identifier("b"),
t.logicalExpression("&&", t.identifier("c"), t.identifier("d")),
),
);
const output = generate(nullishCoalesc).code;
expect(output).toBe(`a ?? (b && c && d)`);
});
it("numeric member expression", function() {
// Should not generate `0.foo`
const mem = t.memberExpression(
t.numericLiteral(60702),
t.identifier("foo"),
);
new Function(generate(mem).code);
});
it("nested if statements needs block", function() {
const ifStatement = t.ifStatement(
t.stringLiteral("top cond"),
t.whileStatement(
t.stringLiteral("while cond"),
t.ifStatement(
t.stringLiteral("nested"),
t.expressionStatement(t.numericLiteral(1)),
),
),
t.expressionStatement(t.stringLiteral("alt")),
);
const ast = parse(generate(ifStatement).code);
expect(ast.program.body[0].consequent.type).toBe("BlockStatement");
});
it("prints directives in block with empty body", function() {
const blockStatement = t.blockStatement(
[],
[t.directive(t.directiveLiteral("use strict"))],
);
const output = generate(blockStatement).code;
expect(output).toBe(`{
"use strict";
}`);
});
it("flow object indentation", function() {
const objectStatement = t.objectTypeAnnotation(
[t.objectTypeProperty(t.identifier("bar"), t.stringTypeAnnotation())],
null,
null,
null,
);
const output = generate(objectStatement).code;
expect(output).toBe(`{
bar: string
}`);
});
it("flow object exact", function() {
const objectStatement = t.objectTypeAnnotation(
[t.objectTypeProperty(t.identifier("bar"), t.stringTypeAnnotation())],
null,
null,
null,
true,
);
const output = generate(objectStatement).code;
expect(output).toBe(`{|
bar: string
|}`);
});
it("flow object indentation with empty leading ObjectTypeProperty", function() {
const objectStatement = t.objectTypeAnnotation(
[],
[
t.objectTypeIndexer(
t.identifier("key"),
t.anyTypeAnnotation(),
t.numberTypeAnnotation(),
),
],
null,
);
const output = generate(objectStatement).code;
expect(output).toBe(`{
[key: any]: number
}`);
});
describe("directives", function() {
it("preserves escapes", function() {
const directive = t.directive(
t.directiveLiteral(String.raw`us\x65 strict`),
);
const output = generate(directive).code;
expect(output).toBe(String.raw`"us\x65 strict";`);
});
it("preserves escapes in minified output", function() {
// https://github.com/babel/babel/issues/4767
const directive = t.directive(t.directiveLiteral(String.raw`foo\n\t\r`));
const output = generate(directive, { minified: true }).code;
expect(output).toBe(String.raw`"foo\n\t\r";`);
});
it("unescaped single quote", function() {
const directive = t.directive(t.directiveLiteral(String.raw`'\'\"`));
const output = generate(directive).code;
expect(output).toBe(String.raw`"'\'\"";`);
});
it("unescaped double quote", function() {
const directive = t.directive(t.directiveLiteral(String.raw`"\'\"`));
const output = generate(directive).code;
expect(output).toBe(String.raw`'"\'\"';`);
});
it("unescaped single and double quotes together throw", function() {
const directive = t.directive(t.directiveLiteral(String.raw`'"`));
expect(() => {
generate(directive);
}).toThrow();
});
});
describe("typescript generate parentheses if necessary", function() {
it("wraps around union for array", () => {
const typeStatement = t.TSArrayType(
t.TSUnionType([
t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
t.TSNullKeyword(),
]),
);
const output = generate(typeStatement).code;
expect(output).toBe("((number & boolean) | null)[]");
});
it("wraps around intersection for array", () => {
const typeStatement = t.TSArrayType(
t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
);
const output = generate(typeStatement).code;
expect(output).toBe("(number & boolean)[]");
});
it("wraps around rest", () => {
const typeStatement = t.tsRestType(
t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
);
const output = generate(typeStatement).code;
expect(output).toBe("...(number & boolean)");
});
it("wraps around optional type", () => {
const typeStatement = t.tsOptionalType(
t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
);
const output = generate(typeStatement).code;
expect(output).toBe("(number & boolean)?");
});
});
});
describe("CodeGenerator", function() {
it("generate", function() {
const codeGen = new CodeGenerator(t.numericLiteral(123));
const code = codeGen.generate().code;
expect(parse(code).program.body[0].expression.value).toBe(123);
});
});
const suites = fixtures(`${__dirname}/fixtures`);
suites.forEach(function(testSuite) {
describe("generation/" + testSuite.title, function() {
testSuite.tests.forEach(function(task) {
const testFn = task.disabled ? it.skip : it;
testFn(
task.title,
function() {
const expected = task.expect;
const actual = task.actual;
const actualCode = actual.code;
if (actualCode) {
const actualAst = parse(actualCode, {
filename: actual.loc,
plugins: task.options.plugins || [],
strictMode: task.options.strictMode === false ? false : true,
sourceType: "module",
sourceMaps: !!task.sourceMap,
...task.options.parserOpts,
});
const options = {
sourceFileName: path.relative(__dirname, actual.loc),
...task.options,
sourceMaps: task.sourceMap ? true : task.options.sourceMaps,
};
const result = generate(actualAst, options, actualCode);
if (options.sourceMaps) {
expect(result.map).toEqual(task.sourceMap);
}
if (
!expected.code &&
result.code &&
fs.statSync(path.dirname(expected.loc)).isDirectory() &&
!process.env.CI
) {
console.log(`New test file created: ${expected.loc}`);
fs.writeFileSync(expected.loc, result.code);
} else {
expect(result.code).toBe(expected.code);
}
}
},
);
});
});
});