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38 lines
1.4 KiB
Plaintext
38 lines
1.4 KiB
Plaintext
import {eatTypeToken, lookaheadType, match} from "../tokenizer/index";
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import {TokenType as tt} from "../tokenizer/types";
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import {isFlowEnabled, isTypeScriptEnabled} from "../traverser/base";
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import {baseParseConditional} from "../traverser/expression";
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import {flowParseTypeAnnotation} from "./flow";
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import {tsParseTypeAnnotation} from "./typescript";
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/**
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* Common parser code for TypeScript and Flow.
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*/
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// An apparent conditional expression could actually be an optional parameter in an arrow function.
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export function typedParseConditional(noIn) {
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// If we see ?:, this can't possibly be a valid conditional. typedParseParenItem will be called
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// later to finish off the arrow parameter. We also need to handle bare ? tokens for optional
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// parameters without type annotations, i.e. ?, and ?) .
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if (match(tt.question)) {
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const nextType = lookaheadType();
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if (nextType === tt.colon || nextType === tt.comma || nextType === tt.parenR) {
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return;
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}
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}
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baseParseConditional(noIn);
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}
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// Note: These "type casts" are *not* valid TS expressions.
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// But we parse them here and change them when completing the arrow function.
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export function typedParseParenItem() {
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eatTypeToken(tt.question);
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if (match(tt.colon)) {
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if (isTypeScriptEnabled) {
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tsParseTypeAnnotation();
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} else if (isFlowEnabled) {
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flowParseTypeAnnotation();
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}
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}
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}
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