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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| import type { ValidatorType } from "../shared/schemas"; | ||
| export type { ValidatorType }; | ||
|
|
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| type StringValidatorType = { type: "string" }; | ||
| type NumberValidatorType = { type: "number" }; | ||
| type BooleanValidatorType = { type: "boolean" }; | ||
|
|
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| export const string = () => ({ type: "string" }) as StringValidatorType; | ||
| export const number = () => ({ type: "number" }) as NumberValidatorType; | ||
| export const boolean = () => ({ type: "boolean" }) as BooleanValidatorType; | ||
|
|
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| export const optional = < | ||
| T extends StringValidatorType | NumberValidatorType | BooleanValidatorType, | ||
| >( | ||
| type: T | ||
| ) => ({ ...type, optional: true }) as const; | ||
|
|
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| export type Infer<T> = T extends StringValidatorType | ||
| ? T extends { optional: true } | ||
| ? string | null | undefined | ||
| : string | ||
| : T extends NumberValidatorType | ||
| ? T extends { optional: true } | ||
| ? number | null | undefined | ||
| : number | ||
| : T extends BooleanValidatorType | ||
| ? T extends { optional: true } | ||
| ? boolean | null | undefined | ||
| : boolean | ||
| : never; | ||
|
|
||
| type Errors = Array<{ | ||
| property: string; | ||
| message: string; | ||
| }>; | ||
|
|
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| export function validate<T extends Record<string, ValidatorType>>( | ||
| userValidator: T, | ||
| user: Record<string, unknown> | ||
| ): | ||
| | { | ||
| errors: Errors; | ||
| value?: never; | ||
| } | ||
| | { | ||
| errors?: never; | ||
| value: { | ||
| [key in keyof T]: Infer<T[keyof T]>; | ||
| }; | ||
| } { | ||
| const returnObject: { | ||
| [key in keyof T]: Infer<T[keyof T]>; | ||
| } = {} as any; | ||
| const errors: Errors = []; | ||
| for (const key in userValidator) { | ||
| const validator = userValidator[key]; | ||
| const value = user[key]; | ||
|
|
||
| if (value === undefined && "optional" in validator) { | ||
| continue; | ||
| } | ||
|
|
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| if (validator.type === "string" && typeof value !== "string") { | ||
| errors.push({ | ||
| property: key, | ||
| message: `Expected string but got ${typeof value}`, | ||
| }); | ||
| } | ||
|
|
||
| if (validator.type === "number" && typeof value !== "number") { | ||
| errors.push({ | ||
| property: key, | ||
| message: `Expected number but got ${typeof value}`, | ||
| }); | ||
| } | ||
|
|
||
| if (validator.type === "boolean" && typeof value !== "boolean") { | ||
| errors.push({ | ||
| property: key, | ||
| message: `Expected boolean but got ${typeof value}`, | ||
| }); | ||
| } | ||
| returnObject[key] = value as Infer<typeof validator>; | ||
| } | ||
| if (errors.length > 0) { | ||
| return { errors }; | ||
| } | ||
| return { value: returnObject }; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| import * as validation from "../src/validation"; | ||
|
|
||
| describe("validation", () => { | ||
| it("produces proper types", () => { | ||
| const booleanValidation = validation.boolean(); | ||
| expectTypeOf< | ||
| validation.Infer<typeof booleanValidation> | ||
| >().toEqualTypeOf<boolean>(); | ||
|
|
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| const stringValidation = validation.string(); | ||
| expectTypeOf< | ||
| validation.Infer<typeof stringValidation> | ||
| >().toEqualTypeOf<string>(); | ||
|
|
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| const numberValidation = validation.number(); | ||
| expectTypeOf< | ||
| validation.Infer<typeof numberValidation> | ||
| >().toEqualTypeOf<number>(); | ||
|
|
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| const optionalNumberValidation = validation.optional(validation.number()); | ||
|
|
||
| expectTypeOf< | ||
| validation.Infer<typeof optionalNumberValidation> | ||
| >().toEqualTypeOf<number | undefined | null>(); | ||
|
|
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| const optionalStringValidation = validation.optional(validation.string()); | ||
|
|
||
| expectTypeOf< | ||
| validation.Infer<typeof optionalStringValidation> | ||
| >().toEqualTypeOf<string | undefined | null>(); | ||
|
|
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| const optionalBooleanValidation = validation.optional(validation.boolean()); | ||
|
|
||
| expectTypeOf< | ||
| validation.Infer<typeof optionalBooleanValidation> | ||
| >().toEqualTypeOf<boolean | undefined | null>(); | ||
| }); | ||
|
|
||
| it("validates properly", () => { | ||
| const userValidator = { | ||
| name: validation.string(), | ||
| age: validation.number(), | ||
| isDeveloper: validation.boolean(), | ||
| }; | ||
| const user = { | ||
| name: "John", | ||
| age: 25, | ||
| isDeveloper: true, | ||
| }; | ||
| expect(validation.validate(userValidator, user)).toEqual({ | ||
| value: user, | ||
| }); | ||
| }); | ||
|
|
||
| it("validates properly with optional fields", () => { | ||
| const userValidator = { | ||
| name: validation.string(), | ||
| age: validation.optional(validation.number()), | ||
| isDeveloper: validation.boolean(), | ||
| }; | ||
| const user = { | ||
| name: "John", | ||
| isDeveloper: true, | ||
| }; | ||
| expect(validation.validate(userValidator, user)).toEqual({ | ||
| value: user, | ||
| }); | ||
| }); | ||
|
|
||
| it("shows errors properly", () => { | ||
| const userValidator = { | ||
| name: validation.string(), | ||
| age: validation.number(), | ||
| isDeveloper: validation.boolean(), | ||
| }; | ||
| const user = { | ||
| name: "John", | ||
| age: "25", | ||
| isDeveloper: true, | ||
| }; | ||
| expect(validation.validate(userValidator, user)).toEqual({ | ||
| errors: [ | ||
| { | ||
| property: "age", | ||
| message: "Expected number but got string", | ||
| }, | ||
| ], | ||
| }); | ||
| }); | ||
| }); |
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