BigInt fixes and unit tests

.gitignore

@@ -0,0 +1 @@
+node_modules/

_examples/node-ts/server-fastify/server.gen.ts

@@ -1,7 +1,7 @@
 /* eslint-disable */
 // node-ts v1.0.0 21701cae51b73d035bf2180831cdb38220bbbccc
 // --
-// Code generated by Webrpc-gen@v0.30.4 with ../../../gen-typescript generator. DO NOT EDIT.
+// Code generated by Webrpc-gen@v0.31.1 with ../../../gen-typescript generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../../gen-typescript -server -out=./server-fastify/server.gen.ts
 
@@ -555,7 +555,7 @@ export const webrpcErrorByCode: { [code: number]: any } = {
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.30.4;gen-typescript@unknown;node-ts@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.31.1;gen-typescript@unknown;node-ts@v1.0.0"
 
 type WebrpcGenVersions = {
   WebrpcGenVersion: string;

_examples/node-ts/server-hono/server.gen.ts

@@ -1,7 +1,7 @@
 /* eslint-disable */
 // node-ts v1.0.0 21701cae51b73d035bf2180831cdb38220bbbccc
 // --
-// Code generated by Webrpc-gen@v0.30.4 with ../../../gen-typescript generator. DO NOT EDIT.
+// Code generated by Webrpc-gen@v0.31.1 with ../../../gen-typescript generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../../gen-typescript -server -out=./server-hono/server.gen.ts
 
@@ -555,7 +555,7 @@ export const webrpcErrorByCode: { [code: number]: any } = {
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.30.4;gen-typescript@unknown;node-ts@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.31.1;gen-typescript@unknown;node-ts@v1.0.0"
 
 type WebrpcGenVersions = {
   WebrpcGenVersion: string;

_examples/node-ts/server/server.gen.ts

@@ -1,7 +1,7 @@
 /* eslint-disable */
 // node-ts v1.0.0 21701cae51b73d035bf2180831cdb38220bbbccc
 // --
-// Code generated by Webrpc-gen@v0.30.4 with ../../../gen-typescript generator. DO NOT EDIT.
+// Code generated by Webrpc-gen@v0.31.1 with ../../../gen-typescript generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../../gen-typescript -server -out=./server/server.gen.ts
 
@@ -555,7 +555,7 @@ export const webrpcErrorByCode: { [code: number]: any } = {
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.30.4;gen-typescript@unknown;node-ts@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.31.1;gen-typescript@unknown;node-ts@v1.0.0"
 
 type WebrpcGenVersions = {
   WebrpcGenVersion: string;

_examples/node-ts/webapp/client.gen.ts

@@ -1,7 +1,7 @@
 /* eslint-disable */
 // node-ts v1.0.0 21701cae51b73d035bf2180831cdb38220bbbccc
 // --
-// Code generated by Webrpc-gen@v0.30.4 with ../../../gen-typescript generator. DO NOT EDIT.
+// Code generated by Webrpc-gen@v0.31.1 with ../../../gen-typescript generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../../gen-typescript -client -out=./webapp/client.gen.ts
 
@@ -496,7 +496,7 @@ export const webrpcErrorByCode: { [code: number]: any } = {
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.30.4;gen-typescript@unknown;node-ts@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.31.1;gen-typescript@unknown;node-ts@v1.0.0"
 
 type WebrpcGenVersions = {
   WebrpcGenVersion: string;

_examples/sse/webapp/client.gen.ts

@@ -1,7 +1,7 @@
 /* eslint-disable */
 // webrpc-sse-chat v1.0.0 a799dc63b082644f5d003c8881424546aee23a2c
 // --
-// Code generated by Webrpc-gen@v0.30.4 with ../../ generator. DO NOT EDIT.
+// Code generated by Webrpc-gen@v0.31.1 with ../../ generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../ -client -out=./webapp/client.gen.ts
 
@@ -565,7 +565,7 @@ export const webrpcErrorByCode: { [code: number]: any } = {
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.30.4;@unknown;webrpc-sse-chat@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.31.1;@unknown;webrpc-sse-chat@v1.0.0"
 
 type WebrpcGenVersions = {
   WebrpcGenVersion: string;

bigintHelpers.go.tmpl

@@ -50,40 +50,6 @@ const BIG_INT_FIELDS: { [typ: string]: (string | [string, string])[] } = {
 {{- end }}
 }
 
-// Encode in-place: mutate provided object graph to serialize bigints to strings.
-function encodeType(typ: string, obj: any): any {
-  if (obj == null || typeof obj !== 'object') return obj
-  const descs = BIG_INT_FIELDS[typ] || []
-  if (!descs.length) return obj
-  for (const d of descs) {
-    if (Array.isArray(d)) {
-      const [fieldName, nestedType] = d
-      if (fieldName.endsWith('[]')) {
-        const base = fieldName.slice(0, -2)
-        const arr = obj[base]
-        if (Array.isArray(arr)) {
-          for (let i = 0; i < arr.length; i++) arr[i] = encodeType(nestedType, arr[i])
-        }
-      } else if (obj[fieldName]) {
-        obj[fieldName] = encodeType(nestedType, obj[fieldName])
-      }
-      continue
-    }
-    if (d.endsWith('[]')) {
-      const base = d.slice(0, -2)
-      const arr = obj[base]
-      if (Array.isArray(arr)) {
-        for (let i = 0; i < arr.length; i++) {
-          if (typeof arr[i] === 'bigint') arr[i] = arr[i].toString()
-        }
-      }
-      continue
-    }
-    if (typeof obj[d] === 'bigint') obj[d] = obj[d].toString()
-  }
-  return obj
-}
-
 // Decode in-place: mutate object graph; throw if expected numeric string is invalid.
 function decodeType(typ: string, obj: any): any {
   if (obj == null || typeof obj !== 'object') return obj
@@ -99,7 +65,16 @@ function decodeType(typ: string, obj: any): any {
           for (let i = 0; i < arr.length; i++) arr[i] = decodeType(nestedType, arr[i])
         }
       } else if (obj[fieldName]) {
-        obj[fieldName] = decodeType(nestedType, obj[fieldName])
+        // Handle nestedType that might be an array type like 'Message[]'
+        if (nestedType.endsWith('[]')) {
+          const baseType = nestedType.slice(0, -2)
+          const arr = obj[fieldName]
+          if (Array.isArray(arr)) {
+            for (let i = 0; i < arr.length; i++) arr[i] = decodeType(baseType, arr[i])
+          }
+        } else {
+          obj[fieldName] = decodeType(nestedType, obj[fieldName])
+        }
       }
       continue
     }
@@ -124,9 +99,11 @@ function decodeType(typ: string, obj: any): any {
   return obj
 }
 
-// Encode object of given root type to JSON with BigInts converted to decimal strings.
-export const JsonEncode = <T = any>(obj: T, typ: string = ''): string => {
-  return JSON.stringify(encodeType(typ, obj))
+// Encode object to JSON with BigInts converted to decimal strings.
+export const JsonEncode = <T = any>(obj: T): string => {
+  return JSON.stringify(obj, (key, value) =>
+    typeof value === 'bigint' ? value.toString() : value
+  )
 }
 
 // Decode data (JSON string or already-parsed object) and convert declared BigInt string fields back to BigInt.

tests-unit/bigint.test.ts

@@ -0,0 +1,162 @@
+import { describe, it, expect } from 'vitest'
+import { JsonEncode, JsonDecode } from './client.gen.js'
+import type { BigIntArrayTest } from './client.gen.js'
+
+
+describe('JsonEncode', () => {
+  it('should encode BigInt arrays and nested objects', () => {
+    const input: BigIntArrayTest = {
+      ids: [1n, 2n, 3n],
+      timestamps: [-100n, 0n, 100n],
+      messages: [
+        { id: 10n, userId: 20n, timestamp: 30n, content: 'test' },
+      ],
+    }
+
+    const encoded = JsonEncode(input)
+    const parsed = JSON.parse(encoded)
+
+    // All BigInt values (arrays and nested objects) encoded as strings
+    expect(parsed).toMatchInlineSnapshot(`
+      {
+        "ids": [
+          "1",
+          "2",
+          "3",
+        ],
+        "messages": [
+          {
+            "content": "test",
+            "id": "10",
+            "timestamp": "30",
+            "userId": "20",
+          },
+        ],
+        "timestamps": [
+          "-100",
+          "0",
+          "100",
+        ],
+      }
+    `)
+  })
+
+  it('should encode large BigInt values exceeding MAX_SAFE_INTEGER', () => {
+    const input: BigIntArrayTest = {
+      ids: [9007199254740992n, 18446744073709551615n],
+      timestamps: [],
+      messages: [],
+    }
+
+    const encoded = JsonEncode(input)
+    const parsed = JSON.parse(encoded)
+
+    expect(parsed).toMatchInlineSnapshot(`
+      {
+        "ids": [
+          "9007199254740992",
+          "18446744073709551615",
+        ],
+        "messages": [],
+        "timestamps": [],
+      }
+    `)
+  })
+})
+
+describe('JsonDecode', () => {
+  it('should decode BigInt arrays and nested objects', () => {
+    const json = JSON.stringify({
+      ids: ['1', '2', '3'],
+      timestamps: ['-100', '0', '100'],
+      messages: [
+        { id: '10', userId: '20', timestamp: '30', content: 'test' },
+      ],
+    })
+
+    const decoded = JsonDecode<BigIntArrayTest>(json, 'BigIntArrayTest')
+
+    // Strings converted to BigInt (arrays and nested objects)
+    expect(decoded).toMatchInlineSnapshot(`
+      {
+        "ids": [
+          1n,
+          2n,
+          3n,
+        ],
+        "messages": [
+          {
+            "content": "test",
+            "id": 10n,
+            "timestamp": 30n,
+            "userId": 20n,
+          },
+        ],
+        "timestamps": [
+          -100n,
+          0n,
+          100n,
+        ],
+      }
+    `)
+    expect(typeof decoded.ids[0]).toBe('bigint')
+    expect(typeof decoded.messages[0].id).toBe('bigint')
+  })
+
+  it('should decode large BigInt values', () => {
+    const json = JSON.stringify({
+      ids: ['9007199254740992', '18446744073709551615'],
+      timestamps: [],
+      messages: [],
+    })
+
+    const decoded = JsonDecode<BigIntArrayTest>(json, 'BigIntArrayTest')
+
+    expect(decoded.ids).toEqual([9007199254740992n, 18446744073709551615n])
+    expect(typeof decoded.ids[0]).toBe('bigint')
+  })
+})
+
+describe('Round-trip', () => {
+  it('should preserve all BigInt values through encode/decode cycle', () => {
+    const original: BigIntArrayTest = {
+      ids: [1n, 9007199254740992n],
+      timestamps: [-100n, 0n, 100n],
+      messages: [
+        { id: 10n, userId: 20n, timestamp: 30n, content: 'test' },
+      ],
+    }
+
+    const encoded = JsonEncode(original)
+    const decoded = JsonDecode<BigIntArrayTest>(encoded, 'BigIntArrayTest')
+
+    expect(decoded).toEqual(original)
+
+  })
+
+  it('should not mutate the original object during encoding or decoding', () => {
+    const original: BigIntArrayTest = {
+      ids: [1n, 2n, 3n],
+      timestamps: [-100n, 0n, 100n],
+      messages: [
+        { id: 10n, userId: 20n, timestamp: 30n, content: 'test' },
+      ],
+    }
+
+    // Create a deep clone to compare against later
+    const originalClone = structuredClone(original)
+
+    // Encode and decode
+    const encoded = JsonEncode(original)
+    const decoded = JsonDecode<BigIntArrayTest>(encoded, 'BigIntArrayTest')
+
+    // Original should be completely unchanged
+    expect(original).toEqual(originalClone)
+    expect(original.ids).toEqual(originalClone.ids)
+    expect(original.messages).toEqual(originalClone.messages)
+
+    // But decoded should be a different reference
+    expect(decoded).not.toBe(original)
+    expect(decoded.ids).not.toBe(original.ids)
+  })
+})