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initTRPC.ts
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initTRPC.ts
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import {
DefaultErrorShape,
defaultFormatter,
ErrorFormatter,
ErrorFormatterShape,
} from '../error/formatter';
import { createFlatProxy } from '../shared/createProxy';
import {
DataTransformerOptions,
DefaultDataTransformer,
defaultTransformer,
getDataTransformer,
} from '../transformer';
import { FlatOverwrite, Unwrap } from '../types';
import {
CreateRootConfigTypes,
isServerDefault,
RootConfig,
RootConfigTypes,
RuntimeConfig,
} from './internals/config';
import { mergeRouters } from './internals/mergeRouters';
import { createBuilder } from './internals/procedureBuilder';
import { PickFirstDefined, ValidateShape } from './internals/utils';
import { createMiddlewareFactory } from './middleware';
import { createRouterFactory } from './router';
type PartialRootConfigTypes = Partial<RootConfigTypes>;
type CreateRootConfigTypesFromPartial<TTypes extends PartialRootConfigTypes> =
CreateRootConfigTypes<{
ctx: TTypes['ctx'] extends RootConfigTypes['ctx'] ? TTypes['ctx'] : object;
meta: TTypes['meta'] extends RootConfigTypes['meta']
? TTypes['meta']
: object;
errorShape: TTypes['errorShape'];
transformer: DataTransformerOptions;
}>;
/**
* TODO: This can be improved:
* - We should be able to chain `.meta()`/`.context()` only once
* - Simplify typings
* - Doesn't need to be a class but it doesn't really hurt either
*/
class TRPCBuilder<TParams extends PartialRootConfigTypes = object> {
context<
TNewContext extends
| RootConfigTypes['ctx']
| ((...args: unknown[]) => RootConfigTypes['ctx']),
>() {
type NextParams = FlatOverwrite<TParams, { ctx: Unwrap<TNewContext> }>;
return new TRPCBuilder<NextParams>();
}
meta<TNewMeta extends RootConfigTypes['meta']>() {
type NextParams = FlatOverwrite<TParams, { meta: TNewMeta }>;
return new TRPCBuilder<NextParams>();
}
create<
TOptions extends Partial<
RuntimeConfig<CreateRootConfigTypesFromPartial<TParams>>
>,
>(
options?:
| ValidateShape<
TOptions,
Partial<RuntimeConfig<CreateRootConfigTypesFromPartial<TParams>>>
>
| undefined,
) {
return createTRPCInner<TParams>()<TOptions>(options);
}
}
/**
* Initialize tRPC - done exactly once per backend
*/
export const initTRPC = new TRPCBuilder();
function createTRPCInner<TParams extends PartialRootConfigTypes>() {
type $Generics = CreateRootConfigTypesFromPartial<TParams>;
type $Context = $Generics['ctx'];
type $Meta = $Generics['meta'];
type $Runtime = Partial<RuntimeConfig<$Generics>>;
return function initTRPCInner<TOptions extends $Runtime>(
runtime?: ValidateShape<TOptions, $Runtime>,
) {
type $Formatter = PickFirstDefined<
TOptions['errorFormatter'],
ErrorFormatter<$Context, DefaultErrorShape>
>;
type $Transformer = TOptions['transformer'] extends DataTransformerOptions
? TOptions['transformer']
: DefaultDataTransformer;
type $ErrorShape = ErrorFormatterShape<$Formatter>;
type $Config = RootConfig<{
ctx: $Context;
meta: $Meta;
errorShape: $ErrorShape;
transformer: $Transformer;
}>;
const errorFormatter = runtime?.errorFormatter ?? defaultFormatter;
const transformer = getDataTransformer(
runtime?.transformer ?? defaultTransformer,
) as $Transformer;
const config: $Config = {
transformer,
isDev:
runtime?.isDev ?? globalThis.process?.env?.NODE_ENV !== 'production',
allowOutsideOfServer: runtime?.allowOutsideOfServer ?? false,
errorFormatter,
isServer: runtime?.isServer ?? isServerDefault,
/**
* @internal
*/
$types: createFlatProxy((key) => {
throw new Error(
`Tried to access "$types.${key}" which is not available at runtime`,
);
}),
};
{
// Server check
const isServer: boolean = runtime?.isServer ?? isServerDefault;
if (!isServer && runtime?.allowOutsideOfServer !== true) {
throw new Error(
`You're trying to use @trpc/server in a non-server environment. This is not supported by default.`,
);
}
}
return {
/**
* These are just types, they can't be used
* @internal
*/
_config: config,
/**
* Builder object for creating procedures
*/
procedure: createBuilder<$Config>({
meta: runtime?.defaultMeta,
}),
/**
* Create reusable middlewares
*/
middleware: createMiddlewareFactory<$Config>(),
/**
* Create a router
*/
router: createRouterFactory<$Config>(config),
/**
* Merge Routers
*/
mergeRouters,
};
};
}