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Throw a syntax error for a parameter properties in not constructor #12061

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merged 2 commits into from Sep 14, 2020
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Throw a syntax error for a parameter properties in not constructor #12061

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3e8b515
Throw a syntax error for a parameter properties in not constructor
sosukesuzuki Sep 14, 2020
ba0bc8e
Avoid test-typescript fails
sosukesuzuki Sep 14, 2020
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11 changes: 6 additions & 5 deletions packages/babel-parser/src/plugins/typescript/index.js
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Expand Up @@ -90,6 +90,8 @@ const TSErrors = Object.freeze({
"Template literal types cannot have any substitution",
TypeAnnotationAfterAssign:
"Type annotations must come before default assignments, e.g. instead of `age = 25: number` use `age: number = 25`",
UnexpectedParameterModifier:
"A parameter property is only allowed in a constructor implementation.",
UnexpectedReadonly:
"'readonly' type modifier is only permitted on array and tuple literal types.",
UnexpectedTypeAnnotation: "Did not expect a type annotation here.",
Expand Down Expand Up @@ -1707,11 +1709,10 @@ export default (superClass: Class<Parser>): Class<Parser> =>
const startPos = this.state.start;
const startLoc = this.state.startLoc;

let accessibility: ?N.Accessibility;
let readonly = false;
if (allowModifiers) {
accessibility = this.parseAccessModifier();
readonly = !!this.tsParseModifier(["readonly"]);
const accessibility = this.parseAccessModifier();
const readonly = !!this.tsParseModifier(["readonly"]);
if (!allowModifiers && (accessibility || readonly)) {
this.raise(startPos, TSErrors.UnexpectedParameterModifier);
}

const left = this.parseMaybeDefault();
Expand Down
11 changes: 11 additions & 0 deletions ...babel-parser/test/fixtures/typescript/class/parameter-properties-not-constructor/input.ts
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@@ -0,0 +1,11 @@
class C {
not_constructor(
readonly r,
public pu: number,
protected po?,
private pi?: number,
public readonly pur,
// Also works on AssignmentPattern
readonly x = 0,
public y?: number = 0) {}
}
199 changes: 199 additions & 0 deletions ...el-parser/test/fixtures/typescript/class/parameter-properties-not-constructor/output.json
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@@ -0,0 +1,199 @@
{
"type": "File",
"start":0,"end":261,"loc":{"start":{"line":1,"column":0},"end":{"line":11,"column":1}},
"errors": [
"SyntaxError: A parameter property is only allowed in a constructor implementation. (3:8)",
"SyntaxError: A parameter property is only allowed in a constructor implementation. (4:8)",
"SyntaxError: A parameter property is only allowed in a constructor implementation. (5:8)",
"SyntaxError: A parameter property is only allowed in a constructor implementation. (6:8)",
"SyntaxError: A parameter property is only allowed in a constructor implementation. (7:8)",
"SyntaxError: A parameter property is only allowed in a constructor implementation. (9:8)",
"SyntaxError: A parameter property is only allowed in a constructor implementation. (10:8)"
],
"program": {
"type": "Program",
"start":0,"end":261,"loc":{"start":{"line":1,"column":0},"end":{"line":11,"column":1}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ClassDeclaration",
"start":0,"end":261,"loc":{"start":{"line":1,"column":0},"end":{"line":11,"column":1}},
"id": {
"type": "Identifier",
"start":6,"end":7,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":7},"identifierName":"C"},
"name": "C"
},
"superClass": null,
"body": {
"type": "ClassBody",
"start":8,"end":261,"loc":{"start":{"line":1,"column":8},"end":{"line":11,"column":1}},
"body": [
{
"type": "ClassMethod",
"start":14,"end":259,"loc":{"start":{"line":2,"column":4},"end":{"line":10,"column":33}},
"static": false,
"key": {
"type": "Identifier",
"start":14,"end":29,"loc":{"start":{"line":2,"column":4},"end":{"line":2,"column":19},"identifierName":"not_constructor"},
"name": "not_constructor"
},
"computed": false,
"kind": "method",
"id": null,
"generator": false,
"async": false,
"params": [
{
"type": "TSParameterProperty",
"start":39,"end":49,"loc":{"start":{"line":3,"column":8},"end":{"line":3,"column":18}},
"readonly": true,
"parameter": {
"type": "Identifier",
"start":48,"end":49,"loc":{"start":{"line":3,"column":17},"end":{"line":3,"column":18},"identifierName":"r"},
"name": "r"
}
},
{
"type": "TSParameterProperty",
"start":59,"end":76,"loc":{"start":{"line":4,"column":8},"end":{"line":4,"column":25}},
"accessibility": "public",
"parameter": {
"type": "Identifier",
"start":66,"end":76,"loc":{"start":{"line":4,"column":15},"end":{"line":4,"column":25},"identifierName":"pu"},
"name": "pu",
"typeAnnotation": {
"type": "TSTypeAnnotation",
"start":68,"end":76,"loc":{"start":{"line":4,"column":17},"end":{"line":4,"column":25}},
"typeAnnotation": {
"type": "TSNumberKeyword",
"start":70,"end":76,"loc":{"start":{"line":4,"column":19},"end":{"line":4,"column":25}}
}
}
}
},
{
"type": "TSParameterProperty",
"start":86,"end":99,"loc":{"start":{"line":5,"column":8},"end":{"line":5,"column":21}},
"accessibility": "protected",
"parameter": {
"type": "Identifier",
"start":96,"end":99,"loc":{"start":{"line":5,"column":18},"end":{"line":5,"column":21},"identifierName":"po"},
"name": "po",
"optional": true
}
},
{
"type": "TSParameterProperty",
"start":109,"end":128,"loc":{"start":{"line":6,"column":8},"end":{"line":6,"column":27}},
"accessibility": "private",
"parameter": {
"type": "Identifier",
"start":117,"end":128,"loc":{"start":{"line":6,"column":16},"end":{"line":6,"column":27},"identifierName":"pi"},
"name": "pi",
"optional": true,
"typeAnnotation": {
"type": "TSTypeAnnotation",
"start":120,"end":128,"loc":{"start":{"line":6,"column":19},"end":{"line":6,"column":27}},
"typeAnnotation": {
"type": "TSNumberKeyword",
"start":122,"end":128,"loc":{"start":{"line":6,"column":21},"end":{"line":6,"column":27}}
}
}
}
},
{
"type": "TSParameterProperty",
"start":138,"end":157,"loc":{"start":{"line":7,"column":8},"end":{"line":7,"column":27}},
"accessibility": "public",
"readonly": true,
"parameter": {
"type": "Identifier",
"start":154,"end":157,"loc":{"start":{"line":7,"column":24},"end":{"line":7,"column":27},"identifierName":"pur"},
"name": "pur"
}
},
{
"type": "TSParameterProperty",
"start":210,"end":224,"loc":{"start":{"line":9,"column":8},"end":{"line":9,"column":22}},
"readonly": true,
"parameter": {
"type": "AssignmentPattern",
"start":219,"end":224,"loc":{"start":{"line":9,"column":17},"end":{"line":9,"column":22}},
"left": {
"type": "Identifier",
"start":219,"end":220,"loc":{"start":{"line":9,"column":17},"end":{"line":9,"column":18},"identifierName":"x"},
"name": "x"
},
"right": {
"type": "NumericLiteral",
"start":223,"end":224,"loc":{"start":{"line":9,"column":21},"end":{"line":9,"column":22}},
"extra": {
"rawValue": 0,
"raw": "0"
},
"value": 0
}
},
"leadingComments": [
{
"type": "CommentLine",
"value": " Also works on AssignmentPattern",
"start":167,"end":201,"loc":{"start":{"line":8,"column":8},"end":{"line":8,"column":42}}
}
]
},
{
"type": "TSParameterProperty",
"start":234,"end":255,"loc":{"start":{"line":10,"column":8},"end":{"line":10,"column":29}},
"accessibility": "public",
"parameter": {
"type": "AssignmentPattern",
"start":241,"end":255,"loc":{"start":{"line":10,"column":15},"end":{"line":10,"column":29}},
"left": {
"type": "Identifier",
"start":241,"end":251,"loc":{"start":{"line":10,"column":15},"end":{"line":10,"column":25},"identifierName":"y"},
"name": "y",
"optional": true,
"typeAnnotation": {
"type": "TSTypeAnnotation",
"start":243,"end":251,"loc":{"start":{"line":10,"column":17},"end":{"line":10,"column":25}},
"typeAnnotation": {
"type": "TSNumberKeyword",
"start":245,"end":251,"loc":{"start":{"line":10,"column":19},"end":{"line":10,"column":25}}
}
}
},
"right": {
"type": "NumericLiteral",
"start":254,"end":255,"loc":{"start":{"line":10,"column":28},"end":{"line":10,"column":29}},
"extra": {
"rawValue": 0,
"raw": "0"
},
"value": 0
}
}
}
],
"body": {
"type": "BlockStatement",
"start":257,"end":259,"loc":{"start":{"line":10,"column":31},"end":{"line":10,"column":33}},
"body": [],
"directives": []
}
}
]
}
}
],
"directives": []
},
"comments": [
{
"type": "CommentLine",
"value": " Also works on AssignmentPattern",
"start":167,"end":201,"loc":{"start":{"line":8,"column":8},"end":{"line":8,"column":42}}
}
]
}
9 changes: 9 additions & 0 deletions packages/babel-parser/test/fixtures/typescript/function/parameter-properties/input.ts
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@@ -0,0 +1,9 @@
function foo(
readonly r,
public pu: number,
protected po?,
private pi?: number,
public readonly pur,
readonly x = 0,
public y?: number = 0
) {}