#3775 Only generate prisma client if it has not been generated (#3780)

.changeset/slow-walls-camp.md

@@ -0,0 +1,5 @@
+---
+"blitz": patch
+---
+
+Only run the prisma generate command when the schema file changes.

packages/blitz/src/cli/utils/codegen-tasks.ts

@@ -5,6 +5,7 @@ import {join} from "path"
 import fs from "fs-extra"
 import {getPackageJson} from "./get-package-json"
 import {runPrisma} from "../../utils/run-prisma"
+import os from "os"
 
 export const codegenTasks = async () => {
   try {
@@ -38,15 +39,33 @@ export const codegenTasks = async () => {
     )
 
     if (hasPrisma) {
-      let prismaSpinner = log.spinner(`Generating Prisma client`).start()
-      const result = await runPrisma(["generate"], true)
-      if (result.success) {
-        prismaSpinner.succeed(log.greenText("Generated Prisma client"))
-      } else {
-        prismaSpinner.fail()
-        console.log("\n" + result.stderr)
-        process.exit(1)
-      }
+        const tempDir = os.tmpdir()
+        const creationDate = await fs.stat(process.cwd())
+        if (!fs.existsSync(join(tempDir, `blitz-${creationDate.birthtimeMs}-prisma-client.json`))) {
+            const lastModified = await fs.stat(join(process.cwd(), "db/schema.prisma"))
+            await fs.writeFile(
+                join(tempDir, `blitz-${creationDate.birthtimeMs}-prisma-client.json`),
+                JSON.stringify({ lastModified: lastModified.mtimeMs }),
+            )
+        }
+        const prismaStatus = await fs.readJson(join(tempDir, `blitz-${creationDate.birthtimeMs}-prisma-client.json`))
+        const lastModified = await fs.stat(join(process.cwd(), "db/schema.prisma"))
+        if (prismaStatus.lastModified !== lastModified.mtimeMs) {
+            let prismaSpinner = log.spinner(`Generating Prisma client`).start()
+            const result = await runPrisma(["generate"], true)
+            if (result.success) {
+                prismaSpinner.succeed(log.greenText("Generated Prisma client"))
+            } else {
+                prismaSpinner.fail()
+                console.log("\n" + result.stderr)
+                process.exit(1)
+            }
+            await fs.writeJson(join(process.cwd(), `blitz-${creationDate.birthtimeMs}-prisma-client.json`), {
+                lastModified: lastModified.mtimeMs,
+            })
+        } else {
+            log.success("Prisma client was up to date")
+        }
     }
   } catch (err) {
     log.error(JSON.stringify(err, null, 2))