46 lines
2.7 KiB
Plaintext
46 lines
2.7 KiB
Plaintext
import type * as core from "../core/index.js";
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import { clone, mergeDefs } from "../core/util.js";
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import { visit } from "../core/visit.js";
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import * as schemas from "./schemas.js";
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// Co-located with the functions: a type and a value can only share a name from one module.
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export type input<T> = core.input<T>;
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export type output<T> = core.output<T>;
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/** Appends a pipe's own checks to the side that replaces it, mirroring how `.check()` clones. */
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function withChecks(side: core.$ZodType, checks: core.$ZodTypeDef["checks"]): core.$ZodType {
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if (!checks?.length) return side;
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const def = side._zod.def;
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return clone(side, mergeDefs(def, { checks: [...(def.checks ?? []), ...checks] }), { parent: true });
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}
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/** The out side, carrying the pipe's own checks: those run against the decoded value, which is what `out` produces. */
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function outSide(def: core.$ZodPipeDef): core.$ZodType {
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return withChecks(def.out, def.checks);
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}
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/** The in side. `z.preprocess` pipes a transform into a schema, and a bare transform validates nothing, so the schema it feeds is the real input side — the resolution `toJSONSchema` already makes for this case. */
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function inSide(def: core.$ZodPipeDef): core.$ZodType {
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return def.in._zod.traits.has("$ZodTransform") ? outSide(def) : def.in;
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}
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/** Returns a copy of the schema with every pipe replaced by its input side. A codec's checks are dropped: they constrain the decoded value the input side never produces. */
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export function input<T extends core.$ZodType>(schema: T): schemas.ZodType<core.input<T>, core.input<T>> {
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return visit(schema, {
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pipe: (s) => inSide(s._zod.def),
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// A default value belongs to the output side, so a rewritten inner type leaves it stranded. `.default()` widens the declared input type with `undefined`, and `optional` is what carries that across.
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default: (s, rewritten) => (rewritten ? schemas.optional(s._zod.def.innerType) : s),
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// A catch value is output-side too, but `.catch()` leaves the declared input type alone, so the inner schema stands on its own.
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catch: (s, rewritten) => (rewritten ? s._zod.def.innerType : s),
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}) as schemas.ZodType<core.input<T>, core.input<T>>;
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}
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/** Returns a copy of the schema with every pipe replaced by its output side, carrying over the pipe's own checks. */
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export function output<T extends core.$ZodType>(schema: T): schemas.ZodType<core.output<T>, core.output<T>> {
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return visit(schema, {
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pipe: (s) => outSide(s._zod.def),
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// A prefault value is fed through the schema, which makes it input-side, so a rewritten inner type leaves it stranded.
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prefault: (s, rewritten) => (rewritten ? s._zod.def.innerType : s),
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}) as schemas.ZodType<core.output<T>, core.output<T>>;
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}
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