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import { Struct, is, Coercer } from '../struct'import { isPlainObject } from '../utils'import { string, unknown } from './types'
/** * Augment a `Struct` to add an additional coercion step to its input. * * This allows you to transform input data before validating it, to increase the * likelihood that it passes validation—for example for default values, parsing * different formats, etc. * * Note: You must use `create(value, Struct)` on the value to have the coercion * take effect! Using simply `assert()` or `is()` will not use coercion. */
export function coerce<T, S, C>(  struct: Struct<T, S>,  condition: Struct<C, any>,  coercer: Coercer<C>): Struct<T, S> {  return new Struct({    ...struct,    coercer: (value, ctx) => {      return is(value, condition)        ? struct.coercer(coercer(value, ctx), ctx)        : struct.coercer(value, ctx)    },  })}
/** * Augment a struct to replace `undefined` values with a default. * * Note: You must use `create(value, Struct)` on the value to have the coercion * take effect! Using simply `assert()` or `is()` will not use coercion. */
export function defaulted<T, S>(  struct: Struct<T, S>,  fallback: any,  options: {    strict?: boolean  } = {}): Struct<T, S> {  return coerce(struct, unknown(), (x) => {    const f = typeof fallback === 'function' ? fallback() : fallback
    if (x === undefined) {      return f    }
    if (!options.strict && isPlainObject(x) && isPlainObject(f)) {      const ret = { ...x }      let changed = false
      for (const key in f) {        if (ret[key] === undefined) {          ret[key] = f[key]          changed = true        }      }
      if (changed) {        return ret      }    }
    return x  })}
/** * Augment a struct to trim string inputs. * * Note: You must use `create(value, Struct)` on the value to have the coercion * take effect! Using simply `assert()` or `is()` will not use coercion. */
export function trimmed<T, S>(struct: Struct<T, S>): Struct<T, S> {  return coerce(struct, string(), (x) => x.trim())}