babel-generate-guard-clauses

Babel-Generate-Guard-Clause

A helper to generate different guard clauses.

Exports

generateTypeCheck(typeAssertion, options)({ name: argumentName })

generateTypeCheck("number")({ name: argumentName })

const typeCheckAst = genertateTypeCheck("string")({ name: "ponies" });

Generated Code:

if (typeof ponies !== "string") {
    throw new Error('ponies should be a string, but got ' + ponies + '(' + typeof ponies +  ')');
}

generateTypeCheck("number", { selector: "selector" })({ name: argumentName })

const typeCheckAst = generateTypeCheck("number", { selector: "x" })({ name: "point" });

Generated Code:

if (typeof point.x !== "number") {
    throw new Error('point.x should be a number, but got ' + point.x + '(' + typeof point.x +  ')');
}

generateIsOneOfCheck

generateIsOneOfCheck(optionArray)({ name: "argName" })

const typeCheckAst = generateIsOneOfCheck(["option1", "option2"])({ name: "argName" });

Generated Code:

if (!['option1', 'option2'].some(x => x === argName)) {
   return new Error("argName should be one of ['option1', 'option2'], but got " + argName);
}