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fix: report missing plugins on type exports (#11417)

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* fix: report missing plugins on type exports

* nit refactors

* Update packages/babel-parser/src/parser/statement.js [skip ci]
This commit is contained in:
Huáng Jùnliàng
2020-04-14 09:23:54 -04:00
committed by GitHub
parent 070ec201bb
commit a466f9c310
15 changed files with 70 additions and 4 deletions
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26
packages/babel-parser/src/parser/statement.js
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@@ -1834,10 +1834,28 @@ export default class StatementParser extends ExpressionParser {
isExportDefaultSpecifier(): boolean {
if (this.match(tt.name)) {
return this.state.value !== "async" && this.state.value !== "let";
}
if (!this.match(tt._default)) {
const value = this.state.value;
if (value === "async" || value === "let") {
return false;
}
if (
(value === "type" || value === "interface") &&
!this.state.containsEsc
) {
const l = this.lookahead();
// If we see any variable name other than `from` after `type` keyword,
// we consider it as flow/typescript type exports
// note that this approach may fail on some pedantic cases
// export type from = number
if (
(l.type === tt.name && l.value !== "from") ||
l.type === tt.braceL
) {
this.expectOnePlugin(["flow", "typescript"]);
return false;
}
}
} else if (!this.match(tt._default)) {
return false;
}