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[ts] Add support for template interpolations in types #12131

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merged 5 commits into from Oct 14, 2020
Merged

[ts] Add support for template interpolations in types #12131

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b72f774
[ts] Add support for template interpolations in types
nicolo-ribaudo Oct 1, 2020
a129419
Update ts allowlist
nicolo-ribaudo Oct 1, 2020
e43be2b
parseTemplateSubstitution
nicolo-ribaudo Oct 2, 2020
aac5c52
Update @babel/types
nicolo-ribaudo Oct 2, 2020
0648b48
typo
nicolo-ribaudo Oct 2, 2020
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7 changes: 6 additions & 1 deletion packages/babel-parser/src/parser/expression.js
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Expand Up @@ -1605,14 +1605,19 @@ export default class ExpressionParser extends LValParser {
node.quasis = [curElt];
while (!curElt.tail) {
this.expect(tt.dollarBraceL);
node.expressions.push(this.parseExpression());
node.expressions.push(this.parseTemplateInterpolation());
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Can we extend parseTemplate in typescript plugin? since it seems to me that TemplateInterpolation is a TS-only concept.

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Isn't it the same concept as for js? i.e. a${x}b is valid both in TS and in JS.
Maybe if I call it parseTemplateSubstitution, which is the language used in the spec?

this.expect(tt.braceR);
node.quasis.push((curElt = this.parseTemplateElement(isTagged)));
}
this.next();
return this.finishNode(node, "TemplateLiteral");
}

// This is overwritten by the TypeScript plugin to parse tepmlate types
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parseTemplateInterpolation(): N.Expression {
return this.parseExpression();
}

// Parse an object literal, binding pattern, or record.

parseObjectLike<T: N.ObjectPattern | N.ObjectExpression>(
Expand Down
16 changes: 6 additions & 10 deletions packages/babel-parser/src/plugins/typescript/index.js
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Expand Up @@ -94,8 +94,6 @@ const TSErrors = Object.freeze({
"Private elements cannot have the 'abstract' modifier.",
PrivateElementHasAccessibility:
"Private elements cannot have an accessibility modifier ('%0')",
TemplateTypeHasSubstitution:
"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:
Expand Down Expand Up @@ -773,17 +771,15 @@ export default (superClass: Class<Parser>): Class<Parser> =>

tsParseTemplateLiteralType(): N.TsType {
const node: N.TsLiteralType = this.startNode();
const templateNode = this.parseTemplate(false);
if (templateNode.expressions.length > 0) {
this.raise(
templateNode.expressions[0].start,
TSErrors.TemplateTypeHasSubstitution,
);
}
node.literal = templateNode;
node.literal = this.parseTemplate(false);
return this.finishNode(node, "TSLiteralType");
}

parseTemplateInterpolation(): N.TsType {
if (this.state.inType) return this.tsParseType();
return super.parseTemplateInterpolation();
}

tsParseThisTypeOrThisTypePredicate(): N.TsThisType | N.TsTypePredicate {
const thisKeyword = this.tsParseThisTypeNode();
if (this.isContextual("is") && !this.hasPrecedingLineBreak()) {
Expand Down
13 changes: 7 additions & 6 deletions packages/babel-parser/test/fixtures/typescript/types/literal-string-2/output.json
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@@ -1,9 +1,6 @@
{
"type": "File",
"start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
"errors": [
"SyntaxError: Template literal types cannot have any substitution (1:14)"
],
"program": {
"type": "Program",
"start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
Expand Down Expand Up @@ -32,9 +29,13 @@
"start":7,"end":19,"loc":{"start":{"line":1,"column":7},"end":{"line":1,"column":19}},
"expressions": [
{
"type": "Identifier",
"start":14,"end":17,"loc":{"start":{"line":1,"column":14},"end":{"line":1,"column":17},"identifierName":"bar"},
"name": "bar"
"type": "TSTypeReference",
"start":14,"end":17,"loc":{"start":{"line":1,"column":14},"end":{"line":1,"column":17}},
"typeName": {
"type": "Identifier",
"start":14,"end":17,"loc":{"start":{"line":1,"column":14},"end":{"line":1,"column":17},"identifierName":"bar"},
"name": "bar"
}
}
],
"quasis": [
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1 change: 1 addition & 0 deletions packages/babel-parser/test/fixtures/typescript/types/literal-string-3/input.ts
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@@ -0,0 +1 @@
let x: `foo-${bar + baz}`;
3 changes: 3 additions & 0 deletions packages/babel-parser/test/fixtures/typescript/types/literal-string-3/options.json
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@@ -0,0 +1,3 @@
{
"throws": "Unexpected token, expected \"}\" (1:18)"
}
1 change: 1 addition & 0 deletions packages/babel-parser/test/fixtures/typescript/types/literal-string-4/input.ts
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@@ -0,0 +1 @@
let x: `foo-${infer bar}`;
73 changes: 73 additions & 0 deletions packages/babel-parser/test/fixtures/typescript/types/literal-string-4/output.json
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@@ -0,0 +1,73 @@
{
"type": "File",
"start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
"program": {
"type": "Program",
"start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "VariableDeclaration",
"start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
"declarations": [
{
"type": "VariableDeclarator",
"start":4,"end":25,"loc":{"start":{"line":1,"column":4},"end":{"line":1,"column":25}},
"id": {
"type": "Identifier",
"start":4,"end":25,"loc":{"start":{"line":1,"column":4},"end":{"line":1,"column":25},"identifierName":"x"},
"name": "x",
"typeAnnotation": {
"type": "TSTypeAnnotation",
"start":5,"end":25,"loc":{"start":{"line":1,"column":5},"end":{"line":1,"column":25}},
"typeAnnotation": {
"type": "TSLiteralType",
"start":7,"end":25,"loc":{"start":{"line":1,"column":7},"end":{"line":1,"column":25}},
"literal": {
"type": "TemplateLiteral",
"start":7,"end":25,"loc":{"start":{"line":1,"column":7},"end":{"line":1,"column":25}},
"expressions": [
{
"type": "TSInferType",
"start":14,"end":23,"loc":{"start":{"line":1,"column":14},"end":{"line":1,"column":23}},
"typeParameter": {
"type": "TSTypeParameter",
"start":20,"end":23,"loc":{"start":{"line":1,"column":20},"end":{"line":1,"column":23}},
"name": "bar"
}
}
],
"quasis": [
{
"type": "TemplateElement",
"start":8,"end":12,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":12}},
"value": {
"raw": "foo-",
"cooked": "foo-"
},
"tail": false
},
{
"type": "TemplateElement",
"start":24,"end":24,"loc":{"start":{"line":1,"column":24},"end":{"line":1,"column":24}},
"value": {
"raw": "",
"cooked": ""
},
"tail": true
}
]
}
}
}
},
"init": null
}
],
"kind": "let"
}
],
"directives": []
}
}