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* fix(javascript): preserve uncertainty after references escape to calls * fix(javascript): track iterator root escapes and preserve static captures * fix(javascript): scope comparison unknowns to their evidence * fix(javascript): track parameter origins at function body entry --------- Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>
38 lines
1.2 KiB
TypeScript
38 lines
1.2 KiB
TypeScript
/** Slots retained by a shallow copy after exclusions or an array prefix. */
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export interface JavaScriptSemanticPropertySelection {
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readonly excludedKeys: readonly string[];
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readonly startIndex?: number;
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}
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/** Internal mutation path, including selected children of a shallow copy. */
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export type JavaScriptSemanticPropertyPath = readonly (
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| string
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| number
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| null
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| JavaScriptSemanticPropertySelection
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)[];
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/** Read only canonical JavaScript array indices, excluding named properties. */
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export const semanticArrayIndex = (key: string | number): number | null => {
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const index = Number(key);
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return Number.isInteger(index) &&
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index >= 0 &&
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index < 4_294_967_295 &&
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String(index) === String(key)
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? index
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: null;
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};
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/** Test an exact key, wildcard, or copied-slot selection against an own key. */
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export const semanticPropertyPathKeyMatches = (
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key: JavaScriptSemanticPropertyPath[number],
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name: string,
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): boolean => {
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if (key === null) return true;
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if (typeof key !== "object") return String(key) === name;
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if (key.excludedKeys.includes(name)) return false;
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if (key.startIndex === undefined) return true;
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const index = semanticArrayIndex(name);
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return index !== null && index >= key.startIndex;
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};
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