feat(settings): allow customization of prisma client import (#49)

Co-authored-by: Jason Kuhrt <jasonkuhrt@me.com>

src/cli/nexus-prisma.ts

@@ -4,7 +4,6 @@
 
 process.env.DEBUG_COLORS = 'true'
 process.env.DEBUG_HIDE_DATE = 'true'
-
 import { generatorHandler } from '@prisma/generator-helper'
 import * as Path from 'path'
 import { generateRuntimeAndEmit } from '../generator'
@@ -26,7 +25,17 @@ generatorHandler({
   },
   // async required by interface
   // eslint-disable-next-line
-  async onGenerate({ dmmf }) {
+  async onGenerate({ dmmf, otherGenerators }) {
+    const prismaClientGenerator = otherGenerators.find((g) => g.provider.value === 'prisma-client-js')
+
+    // WARNING: Make sure this logic comes before `loadUserGentimeSettings` below
+    // otherwise we will overwrite the user's choice for this setting if they have set it.
+    if (prismaClientGenerator?.output?.value) {
+      Gentime.settings.change({
+        prismaClientImportId: prismaClientGenerator.output.value,
+      })
+    }
+
     const internalDMMF = externalToInternalDmmf(dmmf)
     loadUserGentimeSettings()
     generateRuntimeAndEmit(internalDMMF, Gentime.settings)

src/generator/gentime/settingsSingleton.ts

@@ -21,6 +21,24 @@ export namespace Gentime {
            */
           GraphQLDocs?: boolean
         }
+    /**
+     * Where Nexus Prisma will try to import your generated Prisma Client from.
+     *
+     * You should not need to configure this normally because Nexus Prisma generator automatically reads the
+     * Prisma Client generator `output` setting if you have set it.
+     *
+     * The value here will be used in a dynamic import thus following Node's path resolution rules. You can
+     * pass a node_modules package like `foo` `@prisma/client`
+     * `@my/custom/thing` etc. or you can pass an absolute module/file path `/my/custom/thing` /
+     * `/my/custom/thing/index.js` or finally a relative path to be resolved relative to the location of Nexus
+     * Prisma source files (you probably don't want this).
+     *
+     * @remarks Nexus Prisma imports Prisma client internally for two reasons: 1) validation wherein a
+     *          class reference to Prisma Client is needed for some `instanceof` checks and 2) for
+     *          acquiring the DMMF as Nexus Prisma relies on some post-processing done by Prisma Client
+     *          generator.
+     */
+    prismaClientImportId?: string | null
   }
 
   export type SettingsData = Setset.InferDataFromInput<SettingsInput>
@@ -46,6 +64,9 @@ export namespace Gentime {
           },
         },
       },
+      prismaClientImportId: {
+        initial: () => `@prisma/client`,
+      },
     },
   })
 

src/generator/models/javascript.ts

@@ -56,7 +56,7 @@ export function createModuleSpec(gentimeSettings: Gentime.Settings): ModuleSpec
 
       const gentimeSettings = ${JSON.stringify(gentimeSettings.data, null, 2)}
 
-      const dmmf = getPrismaClientDmmf()
+      const dmmf = getPrismaClientDmmf(gentimeSettings.prismaClientImportId)
 
       const models = ModelsGenerator.JS.createNexusTypeDefConfigurations(dmmf, {
         runtime: Runtime.settings,