@flix-tech/fp-ts-type-check
Version:
Type validation in runtime
77 lines • 17.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.discriminatedUnion = exports.arrayOf = exports.nullable = exports.optional = exports.type = exports.keyOf = exports.oneOf = exports.or = exports.and = exports.exact = exports.any = exports.object = exports.number = exports.boolean = exports.string = void 0;
const E = require("fp-ts/lib/Either");
const O = require("fp-ts/lib/Option");
const pipeable_1 = require("fp-ts/lib/pipeable");
const parseError = (message) => ({ path: '', message });
const addKeyPrefix = (part) => (err) => ({
path: `.${part}${err.path}`,
message: err.message,
});
const addIndexPrefix = (index) => (err) => ({
path: `[${index}]${err.path}`,
message: err.message,
});
const traverseParsers = (xs, parser) => {
const results = [];
for (const index in xs) {
const result = parser(xs[index]);
if (E.isLeft(result)) {
return E.mapLeft(addIndexPrefix(index))(result);
}
results.push(result.right);
}
return E.right(results);
};
const typeGuard = (typeName, x) => typeof x === typeName;
const typeParser = (typeName) => (x) => typeGuard(typeName, x)
? E.right(x)
: E.left(parseError('expected ' + typeName + ', got ' + typeof x));
exports.string = typeParser('string');
exports.boolean = typeParser('boolean');
exports.number = typeParser('number');
exports.object = (x) => x === null
? E.left(parseError('expected object, got null'))
: typeGuard('object', x)
? E.right(x)
: E.left(parseError('expected object, got ' + typeof x));
exports.any = E.right;
exports.exact = (expected) => x => expected === x
? E.right(expected)
: E.left(parseError(`expected '${expected}', got '${x}'`));
exports.and = (parserA, parserB) => x => pipeable_1.pipe(parserA(x), E.chain(parserB));
exports.or = (parserA, parserB) => x => {
const a = parserA(x);
return E.isRight(a) ? a : parserB(x);
};
exports.oneOf = (allowed) => x => pipeable_1.pipe(allowed.find(a => a === x), O.fromNullable, E.fromOption(() => parseError(`value ${x} is not in whitelist`)));
const isKeyOf = (a, x) => a.hasOwnProperty(x);
exports.keyOf = (allowed) => x => pipeable_1.pipe(exports.string(x), E.chain(xStr => isKeyOf(allowed, xStr)
? E.right(xStr)
: E.left(parseError(`value ${xStr} is not in whitelist`))));
exports.type = (propertyParsers) => (x) => pipeable_1.pipe(typeParser('object')(x), E.chain((obj) => {
const result = {};
for (const key in propertyParsers) {
if (propertyParsers.hasOwnProperty(key)) {
const parser = propertyParsers[key];
const property = isKeyOf(obj, key) ? obj[key] : undefined;
const parsedProperty = parser(property);
if (E.isLeft(parsedProperty)) {
return E.mapLeft(addKeyPrefix(key.toString()))(parsedProperty);
}
result[key] = parsedProperty.right;
}
}
return E.right(Object.assign(Object.assign({}, obj), result));
}));
exports.optional = (parseBody) => x => x === undefined ? E.right(undefined) : parseBody(x);
exports.nullable = (parseBody) => x => x === null ? E.right(null) : parseBody(x);
exports.arrayOf = (parseBody) => x => Array.isArray(x)
? traverseParsers(x, parseBody)
: E.left(parseError('expected array, got' + typeof x));
exports.discriminatedUnion = (parsers) => x => pipeable_1.pipe(exports.type({ type: exports.keyOf(parsers) })(x), E.chain(xObj => {
const parser = parsers[xObj.type];
return parser(xObj);
}));
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* as E from 'fp-ts/lib/Either';\nimport * as O from 'fp-ts/lib/Option';\nimport { pipe } from 'fp-ts/lib/pipeable';\n\n/**\n * Helper functions to compose \"type guard\"-like functions with strict type checks.\n */\n\nexport interface ParseError {\n  path: string;\n  message: string;\n}\n\nconst parseError = (message: string): ParseError => ({ path: '', message });\nconst addKeyPrefix = (part: string) => (err: ParseError): ParseError => ({\n  path: `.${part}${err.path}`,\n  message: err.message,\n});\nconst addIndexPrefix = (index: string | number) => (\n  err: ParseError\n): ParseError => ({\n  path: `[${index}]${err.path}`,\n  message: err.message,\n});\n\nexport type ParseResult<A> = E.Either<ParseError, A>;\nexport type Parser<OUT, IN = unknown> = {\n  (x: IN): ParseResult<OUT & IN>;\n  right?: (x: OUT) => void; // A fake function to disallow assigning of Parser<A> to Parser<A|B>. Should be undefined.\n};\n\nconst traverseParsers = <A>(\n  xs: unknown[],\n  parser: Parser<A>\n): ParseResult<A[]> => {\n  const results: A[] = [];\n  for (const index in xs) {\n    const result = parser(xs[index]);\n    if (E.isLeft(result)) {\n      return E.mapLeft(addIndexPrefix(index))(result);\n    }\n\n    results.push(result.right);\n  }\n\n  return E.right(results);\n};\n\ntype TypeName<T> = T extends string\n  ? 'string'\n  : T extends number\n  ? 'number'\n  : T extends boolean\n  ? 'boolean'\n  : T extends undefined\n  ? 'undefined'\n  : T extends (...p: any[]) => any\n  ? 'function'\n  : T extends object\n  ? 'object'\n  : 'unknown';\n\nconst typeGuard = <A>(typeName: TypeName<A>, x: unknown): x is A =>\n  typeof x === typeName;\nconst typeParser = <A, IN = unknown>(\n  typeName: TypeName<A>\n): Parser<A & IN, IN> => (x: IN) =>\n  typeGuard<A>(typeName, x)\n    ? E.right(x)\n    : E.left(parseError('expected ' + typeName + ', got ' + typeof x));\n\nexport const string = typeParser<string>('string');\nexport const boolean = typeParser<boolean>('boolean');\nexport const number = typeParser<number>('number');\nexport const object = (x: unknown) =>\n  x === null\n    ? E.left(parseError('expected object, got null'))\n    : typeGuard<Record<string, unknown>>('object', x)\n    ? E.right(x)\n    : E.left(parseError('expected object, got ' + typeof x));\n\nexport const any: Parser<any> = E.right;\n\n// Validates that x matches exactly one value\nexport const exact = <A>(expected: A): Parser<A> => x =>\n  expected === x\n    ? E.right(expected)\n    : E.left(parseError(`expected '${expected}', got '${x}'`));\n\nexport const and = <OUT, MIDDLE, IN = undefined>(\n  parserA: Parser<MIDDLE, IN>,\n  parserB: Parser<OUT, MIDDLE & IN>\n): Parser<MIDDLE & OUT, IN> => x => pipe(parserA(x), E.chain(parserB));\n\nexport const or = <A, B, IN = undefined>(\n  parserA: Parser<A, IN>,\n  parserB: Parser<B, IN>\n): Parser<A | B, IN> => x => {\n  const a: ParseResult<(A | B) & IN> = parserA(x);\n  return E.isRight(a) ? a : parserB(x);\n};\n\n// Validates that x is one of whitelisted values\nexport const oneOf = <A>(allowed: A[]): Parser<A> => x =>\n  pipe(\n    allowed.find(a => a === x),\n    O.fromNullable,\n    E.fromOption(() => parseError(`value ${x} is not in whitelist`))\n  );\n\nconst isKeyOf = <A extends Record<string, unknown>>(\n  a: A,\n  x: string | number | symbol\n): x is keyof A => a.hasOwnProperty(x);\nexport const keyOf = <A extends Record<string, unknown>>(\n  allowed: A\n): Parser<keyof A> => x =>\n  pipe(\n    string(x),\n    E.chain(xStr =>\n      isKeyOf(allowed, xStr)\n        ? E.right(xStr)\n        : E.left(parseError(`value ${xStr} is not in whitelist`))\n    )\n  );\n\n// Validates that x is an object with valid fields\nexport const type = <A, IN = unknown>(\n  propertyParsers: { [K in keyof A]: Parser<A[K]> }\n): Parser<A & IN, IN> => (x: IN) =>\n  pipe(\n    typeParser<Record<string, unknown>, IN>('object')(x),\n    E.chain((obj: IN & Record<string, unknown>) => {\n      const result = {} as A;\n      for (const key in propertyParsers) {\n        if (propertyParsers.hasOwnProperty(key)) {\n          const parser = propertyParsers[key];\n          const property = isKeyOf(obj, key) ? obj[key] : undefined;\n          const parsedProperty = parser(property);\n          if (E.isLeft(parsedProperty)) {\n            return E.mapLeft(addKeyPrefix(key.toString()))(parsedProperty);\n          }\n          result[key] = parsedProperty.right;\n        }\n      }\n      return E.right({ ...obj, ...result } as A & IN);\n    })\n  );\n\n// Validator for optional values\nexport const optional = <A>(parseBody: Parser<A>): Parser<A | undefined> => x =>\n  x === undefined ? E.right(undefined) : parseBody(x);\n\nexport const nullable = <A>(parseBody: Parser<A>): Parser<A | null> => x =>\n  x === null ? E.right(null) : parseBody(x);\n\n// Validates that x is array of type A\nexport const arrayOf = <A>(parseBody: Parser<A>): Parser<A[]> => x =>\n  Array.isArray(x)\n    ? traverseParsers(x, parseBody)\n    : E.left(parseError('expected array, got' + typeof x));\n\ninterface HasTypeField {\n  type: string;\n}\ntype DiscriminatedUnionParsers<T extends HasTypeField> = {\n  [K in T['type']]: T extends { type: K }\n    ? Parser<T, { type: T['type'] }>\n    : never;\n};\n// We expect an object with \"type\" property and we have a parser for each possible type\nexport const discriminatedUnion = <A extends HasTypeField>(\n  parsers: DiscriminatedUnionParsers<A>\n): Parser<A> => x =>\n  pipe(\n    type({ type: keyOf(parsers) })(x),\n    E.chain(xObj => {\n      const parser: Parser<A, { type: A['type'] }> = parsers[xObj.type];\n      return parser(xObj);\n    })\n  );\n"]}