37 lines
1.0 KiB
TypeScript
37 lines
1.0 KiB
TypeScript
export type BooleanParseOptions = {
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truthy?: string[];
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falsy?: string[];
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};
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const DEFAULT_TRUTHY = ["true", "1", "yes", "on"] as const;
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const DEFAULT_FALSY = ["false", "0", "no", "off"] as const;
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const DEFAULT_TRUTHY_SET = new Set<string>(DEFAULT_TRUTHY);
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const DEFAULT_FALSY_SET = new Set<string>(DEFAULT_FALSY);
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export function parseBooleanValue(
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value: unknown,
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options: BooleanParseOptions = {},
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): boolean | undefined {
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if (typeof value === "boolean") {
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return value;
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}
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if (typeof value !== "string") {
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return undefined;
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}
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const normalized = value.trim().toLowerCase();
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if (!normalized) {
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return undefined;
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}
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const truthy = options.truthy ?? DEFAULT_TRUTHY;
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const falsy = options.falsy ?? DEFAULT_FALSY;
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const truthySet = truthy === DEFAULT_TRUTHY ? DEFAULT_TRUTHY_SET : new Set(truthy);
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const falsySet = falsy === DEFAULT_FALSY ? DEFAULT_FALSY_SET : new Set(falsy);
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if (truthySet.has(normalized)) {
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return true;
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}
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if (falsySet.has(normalized)) {
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return false;
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}
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return undefined;
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}
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