27 lines
969 B
TypeScript
27 lines
969 B
TypeScript
import { parse } from "@babel/parser";
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/** Babel AST produced by REA's inert JavaScript parser boundary. */
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export type ParsedJavaScriptSource = ReturnType<typeof parse>;
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/** Parse JavaScript or TypeScript once without attaching comments to AST nodes. */
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export const parseJavaScriptSource = (
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source: string,
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): ParsedJavaScriptSource | null => {
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try {
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return parse(source, {
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sourceType: "unambiguous",
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errorRecovery: true,
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attachComment: false,
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// "decorators-legacy" admits both the standard and the legacy decorator
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// forms, including parameter decorators. Without it a decorated
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// TypeScript source fails to parse at all rather than reporting
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// recovered syntax, which loses every fact derived from that source.
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plugins: ["decorators-legacy", "jsx", "typescript"],
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});
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} catch (cause: unknown) {
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// Unparseable source is represented by the null return.
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void cause;
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return null;
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}
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};
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