graphql-codegen-typescript-validation-schema/dist/esm/scalar.js

GraphQL Code Generator plugin to generate form validation schema from your GraphQL schema

/**
 * Builds a library-specific scalar schema expression.
 *
 * All five validation libraries follow the same pattern: check for a custom
 * `scalarSchemas` override, fall back to a built-in type map for the resolved
 * TypeScript type (string/number/boolean), then apply `defaultScalarTypeSchema`,
 * and finally warn and return the library fallback.
 *
 * The only per-library differences are the strings in `typeMap`, the `fallback`
 * value, and whether custom schemas need wrapping (yup appends `.defined()`).
 */
export function buildScalarSchema(config, visitor, scalarName, options) {
    if (config.scalarSchemas?.[scalarName]) {
        const custom = config.scalarSchemas[scalarName];
        return options.wrapCustom ? options.wrapCustom(custom) : custom;
    }
    const tsType = visitor.getScalarType(scalarName);
    if (tsType != null && tsType in options.typeMap)
        return options.typeMap[tsType];
    if (config.defaultScalarTypeSchema)
        return config.defaultScalarTypeSchema;
    console.warn('unhandled scalar name:', scalarName);
    return options.fallback;
}