fix: standalone ajv schema (#461)

* fix: standalone ajv schemas

* docs: update readme

* types: update types

* docs: update readme

Co-authored-by: Frazer Smith <frazer.dev@outlook.com>

* chore: typo

Co-authored-by: Matteo Collina <hello@matteocollina.com>

* chore: remove console log

* feat: on-demand ajv

* chore: lint

* chore: typo

Co-authored-by: Zed <zedeus@pm.me>

* chore: update types

Co-authored-by: Zed <zedeus@pm.me>

Co-authored-by: Frazer Smith <frazer.dev@outlook.com>
Co-authored-by: Matteo Collina <hello@matteocollina.com>
Co-authored-by: Zed <zedeus@pm.me>

README.md

@@ -679,8 +679,8 @@ console.log(stringify({ firstName: 'Foo', surname: 'bar' })) // '{"firstName":"F
 ### Standalone Mode
 
 The standalone mode is used to compile the code that can be directly run by `node`
-itself. You need to install `fast-json-stringify`, `ajv`, `fast-uri` and `ajv-formats`
-in order to let the standalone code works.
+itself. You need to install `ajv`, `fast-uri` and `ajv-formats` for
+the standalone code to work.
 
 ```js
 const fs = require('fs')

index.d.ts

@@ -1,4 +1,4 @@
-import { Options as AjvOptions } from "ajv"
+import Ajv, { Options as AjvOptions } from "ajv"
 declare namespace build {
   interface BaseSchema {
     /**
@@ -157,14 +157,38 @@ declare namespace build {
      * Optionally configure how the integer will be rounded
      */
     rounding?: 'ceil' | 'floor' | 'round'
+    /**
+     * @deprecated 
+     * Enable debug mode. Please use `mode: "debug"` instead
+     */
+    debugMode?: boolean
+    /**
+     * Running mode of fast-json-stringify
+     */
+    mode?: 'debug' | 'standalone'
   }
 }
 
+interface DebugOption extends build.Options {
+  mode: 'debug'
+}
+
+interface DeprecateDebugOption extends build.Options {
+  debugMode: true
+}
+
+interface StandaloneOption extends build.Options {
+  mode: 'standalone'
+}
+
 /**
  * Build a stringify function using a schema of the documents that should be stringified
  * @param schema The schema used to stringify values
  * @param options The options to use (optional)
  */
+declare function build(schema: build.AnySchema, options: DebugOption): { code: string, ajv: Ajv };
+declare function build(schema: build.AnySchema, options: DeprecateDebugOption): { code: string, ajv: Ajv };
+declare function build(schema: build.AnySchema, options: StandaloneOption): string;
 declare function build(schema: build.AnySchema, options?: build.Options): (doc: any) => any;
 declare function build(schema: build.StringSchema, options?: build.Options): (doc: string) => string;
 declare function build(schema: build.IntegerSchema | build.NumberSchema, options?: build.Options): (doc: number) => string;

index.js

@@ -136,19 +136,9 @@ function build (schema, options) {
   }
 
   if (options.mode === 'standalone') {
-    return `
-'use strict'
-
-const Serializer = require('fast-json-stringify/serializer')
-const buildAjv = require('fast-json-stringify/ajv')
-
-const serializer = new Serializer(${JSON.stringify(options || {})})
-const ajv = buildAjv(${JSON.stringify(options.ajv || {})})
-
-${contextFunctionCode.replace('return main', '')}
-
-module.exports = main
-    `
+    // lazy load
+    const buildStandaloneCode = require('./standalone')
+    return buildStandaloneCode(options, ajvInstance, contextFunctionCode)
   }
 
   /* eslint no-new-func: "off" */

standalone.js

@@ -0,0 +1,42 @@
+const fs = require('fs')
+const path = require('path')
+
+function buildStandaloneCode (options, ajvInstance, contextFunctionCode) {
+  const serializerCode = fs.readFileSync(path.join(__dirname, 'serializer.js')).toString()
+  let buildAjvCode = ''
+  let defaultAjvSchema = ''
+  const defaultMeta = ajvInstance.defaultMeta()
+  if (typeof defaultMeta === 'string') {
+    defaultAjvSchema = defaultMeta
+  } else {
+    defaultAjvSchema = defaultMeta.$id || defaultMeta.id
+  }
+  const shouldUseAjv = contextFunctionCode.indexOf('ajv') !== -1
+  // we need to export the custom json schema
+  let ajvSchemasCode = ''
+  if (shouldUseAjv) {
+    ajvSchemasCode += `const ajv = buildAjv(${JSON.stringify(options.ajv || {})})\n`
+    for (const [id, schema] of Object.entries(ajvInstance.schemas)) {
+      // should skip ajv default schema
+      if (id === defaultAjvSchema) continue
+      ajvSchemasCode += `ajv.addSchema(${JSON.stringify(schema.schema)}, "${id}")\n`
+    }
+    buildAjvCode = fs.readFileSync(path.join(__dirname, 'ajv.js')).toString()
+    buildAjvCode = buildAjvCode.replace("'use strict'", '').replace('module.exports = buildAjv', '')
+  }
+  return `
+  'use strict'
+
+  ${serializerCode.replace("'use strict'", '').replace('module.exports = ', '')}
+  ${buildAjvCode}
+
+  const serializer = new Serializer(${JSON.stringify(options || {})})
+  ${ajvSchemasCode}
+
+  ${contextFunctionCode.replace('return main', '')}
+
+  module.exports = main
+      `
+}
+
+module.exports = buildStandaloneCode

test/standalone-mode.test.js

@@ -5,8 +5,8 @@ const fjs = require('..')
 const fs = require('fs')
 const path = require('path')
 
-function build (opts) {
-  return fjs({
+function build (opts, schema) {
+  return fjs(schema || {
     title: 'default string',
     type: 'object',
     properties: {
@@ -21,10 +21,10 @@ function build (opts) {
 const tmpDir = 'test/fixtures'
 
 test('activate standalone mode', async (t) => {
-  t.plan(2)
-  let code = build({ mode: 'standalone' })
+  t.plan(3)
+  const code = build({ mode: 'standalone' })
   t.type(code, 'string')
-  code = code.replace(/fast-json-stringify/g, '../..')
+  t.equal(code.indexOf('ajv'), -1)
 
   const destionation = path.resolve(tmpDir, 'standalone.js')
 
@@ -36,3 +36,86 @@ test('activate standalone mode', async (t) => {
   const standalone = require(destionation)
   t.same(standalone({ firstName: 'Foo', surname: 'bar' }), JSON.stringify({ firstName: 'Foo' }), 'surname evicted')
 })
+
+test('test ajv schema', async (t) => {
+  t.plan(3)
+  const code = build({ mode: 'standalone' }, {
+    type: 'object',
+    properties: {
+    },
+    if: {
+      type: 'object',
+      properties: {
+        kind: { type: 'string', enum: ['foobar'] }
+      }
+    },
+    then: {
+      type: 'object',
+      properties: {
+        kind: { type: 'string', enum: ['foobar'] },
+        foo: { type: 'string' },
+        bar: { type: 'number' },
+        list: {
+          type: 'array',
+          items: {
+            type: 'object',
+            properties: {
+              name: { type: 'string' },
+              value: { type: 'string' }
+            }
+          }
+        }
+      }
+    },
+    else: {
+      type: 'object',
+      properties: {
+        kind: { type: 'string', enum: ['greeting'] },
+        hi: { type: 'string' },
+        hello: { type: 'number' },
+        list: {
+          type: 'array',
+          items: {
+            type: 'object',
+            properties: {
+              name: { type: 'string' },
+              value: { type: 'string' }
+            }
+          }
+        }
+      }
+    }
+  })
+  t.type(code, 'string')
+  t.equal(code.indexOf('ajv') > 0, true)
+
+  const destionation = path.resolve(tmpDir, 'standalone2.js')
+
+  t.teardown(async () => {
+    await fs.promises.rm(destionation, { force: true })
+  })
+
+  await fs.promises.writeFile(destionation, code)
+  const standalone = require(destionation)
+  t.same(standalone({
+    kind: 'foobar',
+    foo: 'FOO',
+    list: [{
+      name: 'name',
+      value: 'foo'
+    }],
+    bar: 42,
+    hi: 'HI',
+    hello: 45,
+    a: 'A',
+    b: 35
+  }), JSON.stringify({
+    kind: 'foobar',
+    foo: 'FOO',
+    bar: 42,
+    list: [{
+      name: 'name',
+      value: 'foo'
+    }]
+  }))
+})

test/types/test.ts

@@ -1,3 +1,4 @@
+import Ajv from 'ajv'
 import build, { Schema } from '../..'
 
 // Number schemas
@@ -142,4 +143,11 @@ const schema12: Schema = {
   format: 'date-time'
 }
 
-build(schema12)(new Date())
+build(schema12)(new Date())
+
+let str: string, ajv: Ajv
+str = build(schema1, { debugMode: true }).code
+ajv = build(schema1, { debugMode: true }).ajv
+str = build(schema1, { mode: 'debug' }).code
+ajv = build(schema1, { mode: 'debug' }).ajv
+str = build(schema1, { mode: 'standalone' })