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allow directives and other comments before flow pragma (#9891)

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This commit is contained in:
Tan Li Hau
2019-04-27 04:23:35 +08:00
committed by Nicolò Ribaudo
parent ca3c53ae0b
commit 277a2620c6
9 changed files with 1065 additions and 1 deletions
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11
packages/babel-parser/src/plugins/flow.js
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@@ -95,12 +95,21 @@ export default (superClass: Class<Parser>): Class<Parser> =>
return this.getPluginOption("flow", "all") || this.flowPragma === "flow";
}
finishToken(type: TokenType, val: any): void {
if (!(type === tt.string || type === tt.semi)) {
if (this.flowPragma === undefined) {
this.flowPragma = null;
}
}
return super.finishToken(type, val);
}
addComment(comment: N.Comment): void {
if (this.flowPragma === undefined) {
// Try to parse a flow pragma.
const matches = FLOW_PRAGMA_REGEX.exec(comment.value);
if (!matches) {
this.flowPragma = null;
// do nothing
} else if (matches[1] === "flow") {
this.flowPragma = "flow";
} else if (matches[1] === "noflow") {