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Do not use lookahead when parsing dynamic import or import.meta #9983

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merged 1 commit into from May 15, 2019
Merged

Do not use lookahead when parsing dynamic import or import.meta #9983

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33 changes: 15 additions & 18 deletions packages/babel-parser/src/parser/expression.js
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Expand Up @@ -875,19 +875,19 @@ export default class ExpressionParser extends LValParser {
return this.finishNode(node, "Super");

case tt._import:
if (this.lookahead().type === tt.dot) {
return this.parseImportMetaProperty();
node = this.startNode();
this.next();

if (this.match(tt.dot)) {
return this.parseImportMetaProperty(node);
}

this.expectPlugin("dynamicImport");
this.expectPlugin("dynamicImport", node.start);

node = this.startNode();
this.next();
if (!this.match(tt.parenL)) {
this.unexpected(null, tt.parenL);
}
return this.finishNode(node, "Import");

case tt._this:
node = this.startNode();
this.next();
Expand Down Expand Up @@ -1125,20 +1125,17 @@ export default class ExpressionParser extends LValParser {
return this.finishNode(node, "MetaProperty");
}

parseImportMetaProperty(): N.MetaProperty {
const node = this.startNode();
const id = this.parseIdentifier(true);
parseImportMetaProperty(node: N.MetaProperty): N.MetaProperty {
const id = this.createIdentifier(this.startNodeAtNode(node), "import");
this.expect(tt.dot);

if (id.name === "import") {
if (this.isContextual("meta")) {
this.expectPlugin("importMeta");
} else if (!this.hasPlugin("importMeta")) {
this.raise(
id.start,
`Dynamic imports require a parameter: import('a.js')`,
);
}
if (this.isContextual("meta")) {
this.expectPlugin("importMeta");
} else if (!this.hasPlugin("importMeta")) {
this.raise(
id.start,
`Dynamic imports require a parameter: import('a.js')`,
);
}

if (!this.inModule) {
Expand Down