feat: add optional outListingFile config property that copies model listing JSON file as post-generate step

examples/house-game/sde.config.js

@@ -45,19 +45,11 @@ export async function config() {
       }
     },
 
-    plugins: [
-      // Copy the generated model listing to the app so that it can be loaded
-      // at runtime
-      {
-        postGenerate: async context => {
-          const srcPath = joinPath(context.config.prepDir, 'build', 'processed.json')
-          const dstName = 'listing.json'
-          const stagedFilePath = context.prepareStagedFile('model', dstName, generatedFilePath(), dstName)
-          await copyFile(srcPath, stagedFilePath)
-          return true
-        }
-      },
+    // Copy the generated model listing to the app so that it can be loaded
+    // at runtime
+    outListingFile: generatedFilePath('listing.json'),
 
+    plugins: [
       // Generate a `worker.js` file that runs the generated model in a worker
       workerPlugin({
         outputPaths: [generatedFilePath('worker.js')]

packages/build/.gitignore

@@ -1,3 +1,4 @@
 dist
 docs/entry.md
 sde-prep
+tests/build-prod/outputs

packages/build/docs/interfaces/ResolvedConfig.md

@@ -67,3 +67,12 @@ ___
 The code format to generate.  If 'js', the model will be compiled to a JavaScript
 file.  If 'c', the model will be compiled to a C file (in which case an additional
 plugin will be needed to convert the C code to a WebAssembly module).
+
+___
+
+### outListingFile
+
+ `Optional` **outListingFile**: `string`
+
+The absolute path to the JSON file that will be written by the build process that
+lists all dimensions and variables in the model.

packages/build/docs/interfaces/UserConfig.md

@@ -64,6 +64,16 @@ defaults to 'js'.
 
 ___
 
+### outListingFile
+
+ `Optional` **outListingFile**: `string`
+
+If defined, the build process will write a JSON file to the provided path that lists
+all dimensions and variables in the model.  This can be an absolute path, or if it
+is a relative path it will be resolved relative to the `rootDir` for the project.
+
+___
+
 ### plugins
 
  `Optional` **plugins**: [`Plugin`](Plugin.md)[]

packages/build/src/_shared/resolved-config.ts

@@ -49,6 +49,12 @@ export interface ResolvedConfig {
    */
   genFormat: 'js' | 'c'
 
+  /**
+   * The absolute path to the JSON file that will be written by the build process that
+   * lists all dimensions and variables in the model.
+   */
+  outListingFile?: string
+
   /**
    * The path to the `@sdeverywhere/cli` package.  This is currently only used to get
    * access to the files in the `src/c` directory.

packages/build/src/build/impl/gen-model.ts

@@ -1,7 +1,7 @@
 // Copyright (c) 2022 Climate Interactive / New Venture Fund
 
 import { copyFile, readdir, readFile, writeFile } from 'fs/promises'
-import { join as joinPath } from 'path'
+import { basename, dirname, join as joinPath } from 'path'
 
 import { log } from '../../_shared/log'
 
@@ -87,6 +87,17 @@ export async function generateModel(context: BuildContext, plugins: Plugin[]): P
     await copyFile(generatedCodePath, stagedOutputJsPath)
   }
 
+  if (config.outListingFile) {
+    // Copy the model listing file
+    const srcListingJsonPath = joinPath(prepDir, 'build', 'processed.json')
+    const stagedDir = 'model'
+    const stagedFile = 'listing.json'
+    const dstDir = dirname(config.outListingFile)
+    const dstFile = basename(config.outListingFile)
+    const stagedListingJsonPath = context.prepareStagedFile(stagedDir, stagedFile, dstDir, dstFile)
+    await copyFile(srcListingJsonPath, stagedListingJsonPath)
+  }
+
   const t1 = performance.now()
   const elapsed = ((t1 - t0) / 1000).toFixed(1)
   log('info', `Done generating model (${elapsed}s)`)

packages/build/src/config/config-loader.ts

@@ -1,7 +1,7 @@
 // Copyright (c) 2022 Climate Interactive / New Venture Fund
 
 import { existsSync, lstatSync, mkdirSync } from 'fs'
-import { dirname, join as joinPath, relative, resolve as resolvePath } from 'path'
+import { dirname, isAbsolute, join as joinPath, relative, resolve as resolvePath } from 'path'
 import { fileURLToPath } from 'url'
 
 import type { Result } from 'neverthrow'
@@ -171,6 +171,17 @@ function resolveUserConfig(
       throw new Error(`The configured genFormat value is invalid; must be either 'js' or 'c'`)
   }
 
+  // Validate the out listing file, if defined
+  let outListingFile: string
+  if (userConfig.outListingFile) {
+    // Get the absolute path of the output file
+    if (isAbsolute(userConfig.outListingFile)) {
+      outListingFile = userConfig.outListingFile
+    } else {
+      outListingFile = resolvePath(rootDir, userConfig.outListingFile)
+    }
+  }
+
   return {
     mode,
     rootDir,
@@ -179,6 +190,7 @@ function resolveUserConfig(
     modelInputPaths,
     watchPaths,
     genFormat,
+    outListingFile,
     sdeDir,
     sdeCmdPath
   }

packages/build/src/config/user-config.ts

@@ -48,6 +48,13 @@ export interface UserConfig {
    */
   genFormat?: 'js' | 'c'
 
+  /**
+   * If defined, the build process will write a JSON file to the provided path that lists
+   * all dimensions and variables in the model.  This can be an absolute path, or if it
+   * is a relative path it will be resolved relative to the `rootDir` for the project.
+   */
+  outListingFile?: string
+
   /**
    * The array of plugins that are used to customize the build process.  These will be
    * executed in the order defined here.

packages/build/tests/build/build-dev.spec.ts → packages/build/tests/build-dev/build-dev.spec.ts

@@ -1,13 +1,15 @@
 // Copyright (c) 2022 Climate Interactive / New Venture Fund
 
-import { resolve as resolvePath } from 'path'
+import { rmSync } from 'node:fs'
+import { resolve as resolvePath } from 'node:path'
 
-import { describe, expect, it } from 'vitest'
+import { beforeEach, describe, expect, it } from 'vitest'
 
 import type { ModelSpec, UserConfig } from '../../src'
 import { build } from '../../src'
 
 import { buildOptions } from '../_shared/build-options'
+import {} from 'vitest'
 
 const modelSpec: ModelSpec = {
   inputs: [{ varName: 'Y', defaultValue: 0, minValue: -10, maxValue: 10 }],
@@ -16,6 +18,11 @@ const modelSpec: ModelSpec = {
 }
 
 describe('build in development mode', () => {
+  beforeEach(() => {
+    const prepDir = resolvePath(__dirname, 'sde-prep')
+    rmSync(prepDir, { recursive: true, force: true })
+  })
+
   it('should return undefined exit code', async () => {
     const userConfig: UserConfig = {
       rootDir: resolvePath(__dirname, '..'),

packages/build/tests/build/build-prod.spec.ts → packages/build/tests/build-prod/build-prod.spec.ts

@@ -1,8 +1,9 @@
 // Copyright (c) 2022 Climate Interactive / New Venture Fund
 
-import { resolve as resolvePath } from 'path'
+import { existsSync, rmSync } from 'node:fs'
+import { join as joinPath, resolve as resolvePath } from 'node:path'
 
-import { describe, expect, it } from 'vitest'
+import { beforeEach, describe, expect, it } from 'vitest'
 
 import type { ModelSpec, Plugin, UserConfig } from '../../src'
 import { build } from '../../src'
@@ -56,6 +57,59 @@ const plugin = (num: number, calls: string[]) => {
 }
 
 describe('build in production mode', () => {
+  beforeEach(() => {
+    const prepDir = resolvePath(__dirname, 'sde-prep')
+    rmSync(prepDir, { recursive: true, force: true })
+
+    const outputsDir = resolvePath(__dirname, 'outputs')
+    rmSync(outputsDir, { recursive: true, force: true })
+  })
+
+  it('should write listing.json file (when absolute path is provided)', async () => {
+    const userConfig: UserConfig = {
+      genFormat: 'c',
+      rootDir: resolvePath(__dirname, '..'),
+      prepDir: resolvePath(__dirname, 'sde-prep'),
+      modelFiles: [resolvePath(__dirname, '..', '_shared', 'sample.mdl')],
+      // Note that `outListingFile` is specified with an absolute path here
+      outListingFile: resolvePath(__dirname, 'outputs', 'listing.json'),
+      modelSpec: async () => {
+        return modelSpec
+      }
+    }
+
+    const result = await build('production', buildOptions(userConfig))
+    if (result.isErr()) {
+      throw new Error('Expected ok result but got: ' + result.error.message)
+    }
+
+    expect(result.value.exitCode).toBe(0)
+    expect(existsSync(resolvePath(__dirname, 'outputs', 'listing.json'))).toBe(true)
+  })
+
+  it('should write listing.json file (when relative path is provided)', async () => {
+    const userConfig: UserConfig = {
+      genFormat: 'c',
+      rootDir: resolvePath(__dirname, '..'),
+      prepDir: resolvePath(__dirname, 'sde-prep'),
+      modelFiles: [resolvePath(__dirname, '..', '_shared', 'sample.mdl')],
+      // Note that `outListingFile` is specified with a relative path here, which
+      // will be resolved relative to `rootDir`
+      outListingFile: joinPath('build-prod', 'outputs', 'listing.json'),
+      modelSpec: async () => {
+        return modelSpec
+      }
+    }
+
+    const result = await build('production', buildOptions(userConfig))
+    if (result.isErr()) {
+      throw new Error('Expected ok result but got: ' + result.error.message)
+    }
+
+    expect(result.value.exitCode).toBe(0)
+    expect(existsSync(resolvePath(__dirname, 'outputs', 'listing.json'))).toBe(true)
+  })
+
   it('should skip certain callbacks if model files array is empty', async () => {
     const calls: string[] = []
 

packages/build/tests/config/config.spec.ts

@@ -1,14 +1,20 @@
 // Copyright (c) 2022 Climate Interactive / New Venture Fund
 
-import { join as joinPath } from 'path'
+import { rmSync } from 'node:fs'
+import { join as joinPath } from 'node:path'
 
-import { describe, expect, it } from 'vitest'
+import { beforeEach, describe, expect, it } from 'vitest'
 
 import { build } from '../../src'
 
 import { buildOptions } from '../_shared/build-options'
 
 describe('build config file loading', () => {
+  beforeEach(() => {
+    const prepDir = joinPath(__dirname, 'sde-prep')
+    rmSync(prepDir, { recursive: true, force: true })
+  })
+
   it('should fail if config file cannot be found', async () => {
     const configPath = joinPath(__dirname, 'sde.unknown.js')
     const result = await build('production', buildOptions(configPath))