@monstermann/match/dist/index.mjs

Zero-runtime exhaustive pattern matching.

//#region src/Exhaustive.ts
var Exhaustive = class {
	constructor(value) {
		this.value = value;
	}
	case() {
		return this;
	}
	cond() {
		return this;
	}
	onCase() {
		return this;
	}
	onCond() {
		return this;
	}
	or() {
		return this.value;
	}
	orElse() {
		return this.value;
	}
	orThrow() {
		return this.value;
	}
	returnType() {
		return this;
	}
};

//#endregion
//#region src/Value.ts
var Value = class {
	constructor(value) {
		this.value = value;
	}
	case(value, result) {
		if (value !== this.value) return this;
		return new Exhaustive(result);
	}
	cond(predicate, result) {
		if (!predicate(this.value)) return this;
		return new Exhaustive(result);
	}
	onCase(value, result) {
		if (value !== this.value) return this;
		return new Exhaustive(result(value));
	}
	onCond(predicate, result) {
		if (!predicate(this.value)) return this;
		return new Exhaustive(result(this.value));
	}
	or(fallback) {
		return fallback;
	}
	orElse(fallback) {
		return fallback(this.value);
	}
	orThrow() {
		throw new Error(`Pattern matching error: no pattern matches value ${this.value}`);
	}
	returnType() {
		return this;
	}
};

//#endregion
//#region src/Shape.ts
var Shape = class extends Value {
	case(value, result) {
		for (const key in value) if (this.value[key] !== value[key]) return this;
		return new Exhaustive(result);
	}
	onCase(value, result) {
		for (const key in value) if (this.value[key] !== value[key]) return this;
		return new Exhaustive(result(this.value));
	}
	orThrow() {
		throw new Error(`Pattern matching error: no pattern matches value ${JSON.stringify(this.value)}`);
	}
};

//#endregion
//#region src/match.ts
const match = function(value) {
	return new Value(value);
};
match.shape = function(value) {
	return new Shape(value);
};

//#endregion
export { match };