53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
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/* eslint-disable no-underscore-dangle */
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export const DynamicImportKey = 'Import';
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export default function injectDynamicImport(acorn) {
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const tt = acorn.tokTypes;
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// NOTE: This allows `yield import()` to parse correctly.
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tt._import.startsExpr = true;
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function parseDynamicImport() {
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const node = this.startNode();
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this.next();
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if (this.type !== tt.parenL) {
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this.unexpected();
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}
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return this.finishNode(node, DynamicImportKey);
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}
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function peekNext() {
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return this.input[this.pos];
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}
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// eslint-disable-next-line no-param-reassign
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acorn.plugins.dynamicImport = function dynamicImportPlugin(instance) {
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instance.extend('parseStatement', nextMethod => (
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function parseStatement(...args) {
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const node = this.startNode();
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if (this.type === tt._import) {
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const nextToken = peekNext.call(this);
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if (nextToken === tt.parenL.label) {
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const expr = this.parseExpression();
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return this.parseExpressionStatement(node, expr);
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}
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}
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return nextMethod.apply(this, args);
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}
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));
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instance.extend('parseExprAtom', nextMethod => (
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function parseExprAtom(refDestructuringErrors) {
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if (this.type === tt._import) {
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return parseDynamicImport.call(this);
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}
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return nextMethod.call(this, refDestructuringErrors);
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}
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));
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};
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return acorn;
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}
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