feat: add importSuffix option and remove default .js suffix

Adds a new option: importSuffix: which enables setting the suffix used to import
.ts files directly.

The default is to import with no suffix, with foo.ts:

import './foo';

With "importSuffix=.js"

import './foo.js';

Fixes compatibility with TypeScript < 4.7.x.

Signed-off-by: Christian Stewart <christian@paral.in>

README.markdown

@@ -388,6 +388,8 @@ Generated code will be placed in the Gradle build directory.
 
 - With `--ts_proto_opt=fileSuffix=<SUFFIX>`, ts-proto will emit generated files using the specified suffix. A `helloworld.proto` file with `fileSuffix=.pb` would be generated as `helloworld.pb.ts`. This is common behavior in other protoc plugins and provides a way to quickly glob all the generated files.
 
+- With `--ts_proto_opt=importSuffix=<SUFFIX>`, ts-proto will emit file imports using the specified suffix. An import of `helloworld.ts` with `fileSuffix=.js` would generate `import "helloworld.js"`. The default is to import without a file extension. Supported by TypeScript 4.7.x and up.
+
 - With `--ts_proto_opt=enumsAsLiterals=true`, the generated enum types will be enum-ish object with `as const`.
 
 - With `--ts_proto_opt=useExactTypes=false`, the generated `fromPartial` method will not use Exact types.

integration/avoid-import-conflicts-types-only/simple.ts

@@ -1,5 +1,5 @@
 /* eslint-disable */
-import type { SimpleEnum as SimpleEnum1, Simple as Simple2 } from './simple2.js';
+import type { SimpleEnum as SimpleEnum1, Simple as Simple2 } from './simple2';
 
 export const protobufPackage = 'simple';
 

integration/avoid-import-conflicts/simple.ts

@@ -4,7 +4,7 @@ import {
   Simple as Simple2,
   simpleEnumFromJSON as simpleEnumFromJSON3,
   simpleEnumToJSON as simpleEnumToJSON4,
-} from './simple2.js';
+} from './simple2';
 import * as _m0 from 'protobufjs/minimal';
 
 export const protobufPackage = 'simple';

integration/barrel-imports/foo.ts

@@ -1,5 +1,5 @@
 /* eslint-disable */
-import { Bar } from './bar.js';
+import { Bar } from './bar';
 import * as _m0 from 'protobufjs/minimal';
 
 export interface Foo {

integration/bytes-node/point.ts

@@ -1,6 +1,6 @@
 /* eslint-disable */
 import * as _m0 from 'protobufjs/minimal';
-import { BytesValue } from './google/protobuf/wrappers.js';
+import { BytesValue } from './google/protobuf/wrappers';
 
 export const protobufPackage = '';
 

integration/fieldmask/fieldmask.ts

@@ -1,6 +1,6 @@
 /* eslint-disable */
 import * as _m0 from 'protobufjs/minimal';
-import { FieldMask } from './google/protobuf/field_mask.js';
+import { FieldMask } from './google/protobuf/field_mask';
 
 export const protobufPackage = '';
 

integration/file-suffix/parent.pb.ts

@@ -1,6 +1,6 @@
 /* eslint-disable */
-import { ChildEnum, Child, childEnumFromJSON, childEnumToJSON } from './child.pb.js';
-import { Timestamp } from './google/protobuf/timestamp.pb.js';
+import { ChildEnum, Child, childEnumFromJSON, childEnumToJSON } from './child.pb';
+import { Timestamp } from './google/protobuf/timestamp.pb';
 import * as _m0 from 'protobufjs/minimal';
 
 export const protobufPackage = 'file_suffix';

integration/grpc-js/simple.ts

@@ -17,8 +17,8 @@ import {
   ClientDuplexStream,
   ServiceError,
 } from '@grpc/grpc-js';
-import { Timestamp } from './google/protobuf/timestamp.js';
-import { Empty } from './google/protobuf/empty.js';
+import { Timestamp } from './google/protobuf/timestamp';
+import { Empty } from './google/protobuf/empty';
 import {
   StringValue,
   Int64Value,
@@ -29,8 +29,8 @@ import {
   FloatValue,
   DoubleValue,
   BoolValue,
-} from './google/protobuf/wrappers.js';
-import { Struct, ListValue, Value } from './google/protobuf/struct.js';
+} from './google/protobuf/wrappers';
+import { Struct, ListValue, Value } from './google/protobuf/struct';
 import * as _m0 from 'protobufjs/minimal';
 
 export const protobufPackage = 'simple';

integration/import-suffix/child.pb.ts

@@ -0,0 +1,111 @@
+/* eslint-disable */
+import * as _m0 from 'protobufjs/minimal';
+
+export const protobufPackage = 'file_suffix';
+
+export enum ChildEnum {
+  DEFAULT = 0,
+  FOO = 1,
+  UNRECOGNIZED = -1,
+}
+
+export function childEnumFromJSON(object: any): ChildEnum {
+  switch (object) {
+    case 0:
+    case 'DEFAULT':
+      return ChildEnum.DEFAULT;
+    case 1:
+    case 'FOO':
+      return ChildEnum.FOO;
+    case -1:
+    case 'UNRECOGNIZED':
+    default:
+      return ChildEnum.UNRECOGNIZED;
+  }
+}
+
+export function childEnumToJSON(object: ChildEnum): string {
+  switch (object) {
+    case ChildEnum.DEFAULT:
+      return 'DEFAULT';
+    case ChildEnum.FOO:
+      return 'FOO';
+    case ChildEnum.UNRECOGNIZED:
+    default:
+      return 'UNRECOGNIZED';
+  }
+}
+
+export interface Child {
+  name: string;
+}
+
+function createBaseChild(): Child {
+  return { name: '' };
+}
+
+export const Child = {
+  encode(message: Child, writer: _m0.Writer = _m0.Writer.create()): _m0.Writer {
+    if (message.name !== '') {
+      writer.uint32(10).string(message.name);
+    }
+    return writer;
+  },
+
+  decode(input: _m0.Reader | Uint8Array, length?: number): Child {
+    const reader = input instanceof _m0.Reader ? input : new _m0.Reader(input);
+    let end = length === undefined ? reader.len : reader.pos + length;
+    const message = createBaseChild();
+    while (reader.pos < end) {
+      const tag = reader.uint32();
+      switch (tag >>> 3) {
+        case 1:
+          message.name = reader.string();
+          break;
+        default:
+          reader.skipType(tag & 7);
+          break;
+      }
+    }
+    return message;
+  },
+
+  fromJSON(object: any): Child {
+    return {
+      name: isSet(object.name) ? String(object.name) : '',
+    };
+  },
+
+  toJSON(message: Child): unknown {
+    const obj: any = {};
+    message.name !== undefined && (obj.name = message.name);
+    return obj;
+  },
+
+  fromPartial<I extends Exact<DeepPartial<Child>, I>>(object: I): Child {
+    const message = createBaseChild();
+    message.name = object.name ?? '';
+    return message;
+  },
+};
+
+type Builtin = Date | Function | Uint8Array | string | number | boolean | undefined;
+
+export type DeepPartial<T> = T extends Builtin
+  ? T
+  : T extends Array<infer U>
+  ? Array<DeepPartial<U>>
+  : T extends ReadonlyArray<infer U>
+  ? ReadonlyArray<DeepPartial<U>>
+  : T extends {}
+  ? { [K in keyof T]?: DeepPartial<T[K]> }
+  : Partial<T>;
+
+type KeysOfUnion<T> = T extends T ? keyof T : never;
+export type Exact<P, I extends P> = P extends Builtin
+  ? P
+  : P & { [K in keyof P]: Exact<P[K], I[K]> } & Record<Exclude<keyof I, KeysOfUnion<P>>, never>;
+
+function isSet(value: any): boolean {
+  return value !== null && value !== undefined;
+}

integration/import-suffix/child.proto

@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package file_suffix;
+
+message Child {
+  string name = 1;
+}
+
+enum ChildEnum {
+  DEFAULT = 0;
+  FOO = 1;
+}