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[typescript] parsing template literal as type (#9748)

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This commit is contained in:
Tan Li Hau
2019-03-26 06:21:11 +08:00
committed by Nicolò Ribaudo
parent 444daf9224
commit 2867bbf195
6 changed files with 179 additions and 1 deletions
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15
packages/babel-parser/src/plugins/typescript.js
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@@ -660,6 +660,19 @@ export default (superClass: Class<Parser>): Class<Parser> =>
return this.finishNode(node, "TSLiteralType");
}
tsParseTemplateLiteralType(): N.TsType {
const node: N.TsLiteralType = this.startNode();
const templateNode = this.parseTemplate(false);
if (templateNode.expressions.length > 0) {
throw this.raise(
templateNode.expressions[0].start,
"Template literal types cannot have any substitution",
);
}
node.literal = templateNode;
return this.finishNode(node, "TSLiteralType");
}
tsParseNonArrayType(): N.TsType {
switch (this.state.type) {
case tt.name:
@@ -712,6 +725,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
return this.tsParseTupleType();
case tt.parenL:
return this.tsParseParenthesizedType();
case tt.backQuote:
return this.tsParseTemplateLiteralType();
}
throw this.unexpected();

2
packages/babel-parser/src/types.js
View File

@@ -1308,7 +1308,7 @@ export type TsMappedType = TsTypeBase & {
export type TsLiteralType = TsTypeBase & {
type: "TSLiteralType",
literal: NumericLiteral | StringLiteral | BooleanLiteral,
literal: NumericLiteral | StringLiteral | BooleanLiteral | TemplateLiteral,
};
export type TsImportType = TsTypeBase & {