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Gabriela Araujo Britto (gabritto) wants to merge 3 commits into
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Add createProgram to API #63950

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408c163
add createProgram to API
gabritto Aug 21, 2026
bb72421
fixes after merge
gabritto Aug 21, 2026
3155316
refactor
gabritto Aug 21, 2026
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80 changes: 73 additions & 7 deletions packages/typescript/src/api/async/api.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,10 @@ import {
toPath,
} from "../path.ts";
import type {
APIFileChanges,
CompilerOptions,
CreateProgramOptions,
CreateProgramResponse,
Diagnostic,
DocumentIdentifier,
DocumentPosition,
Expand Down Expand Up @@ -135,6 +138,7 @@ import type {
export { documentURIToFileName, fileNameToDocumentURI } from "../path.ts";
export { CheckFlags, CompletionItemKind, DiagnosticCategory, ElementFlags, EmitOnly, ModifierFlags, ModuleKind, NodeBuilderFlags, ObjectFlags, SignatureFlags, SignatureKind, SymbolFlags, TypeFlags, TypeFormatFlags, TypePredicateKind };
export type {
APIFileChanges,
APIImportAdderAction as ImportAdderAction,
APIOptions,
AssertsIdentifierTypePredicate,
Expand All @@ -148,6 +152,7 @@ export type {
CompletionInfo,
CompletionOptions,
ConditionalType,
CreateProgramOptions,
Diagnostic,
DocumentIdentifier,
DocumentPosition,
Expand Down Expand Up @@ -387,6 +392,46 @@ export class API<FromLSP extends boolean = false> {
resetTimingInfo(): Promise<void> {
return this.client.resetTimingInfo();
}

/**
* Creates a program from current filesystem state, or derives one from oldProgram after applying fileChanges.
*/
async createProgram(
rootFiles: readonly DocumentIdentifier[],
createProgramOptions: CreateProgramOptions,
oldProgram?: Program,
fileChanges?: APIFileChanges,
): Promise<Program> {
await this.ensureInitialized();

if (fileChanges && !oldProgram) {
throw new Error("fileChanges requires an oldProgram");
}

const data: CreateProgramResponse = await this.client.apiRequest("createProgram", {
rootFiles,
createProgramOptions,
...(oldProgram ? { oldProgram: { snapshot: oldProgram.snapshotId, project: oldProgram.getProject().id } } : {}),
...(fileChanges ? { fileChanges } : {}),
Comment on lines +411 to +415
});
if (!data.project) {
throw new Error("createProgram did not return a project");
}
const snapshot = new Snapshot(
{ snapshot: data.snapshot, projects: [data.project] },
this.client,
this.sourceFileCache,
this.toPath!,
() => {
this.activeSnapshots.delete(snapshot);
this.sourceFileCache.releaseSnapshot(snapshot.id);
},
);
const program = snapshot.getProjects()[0].program;
program.setOwnedSnapshot(snapshot);
this.activeSnapshots.add(snapshot);
return program;
}
}

export class InternalAPI {
Expand Down Expand Up @@ -947,13 +992,15 @@ export class LanguageService {
}

export class Program {
private snapshotId: number;
private project: Project;
private client: Client;
private sourceFileCache: SourceFileCache;
private toPath: (fileName: string) => Path;
private decoder = new Wtf8Decoder();
private sourceFileMetadataCache = new Map<Path, Promise<SourceFileMetadata | undefined>>();
/** @internal */
readonly snapshotId: number;
private readonly project: Project;
private readonly client: Client;
private readonly sourceFileCache: SourceFileCache;
private readonly toPath: (fileName: string) => Path;
private readonly decoder = new Wtf8Decoder();
private readonly sourceFileMetadataCache = new Map<Path, Promise<SourceFileMetadata | undefined>>();
private ownedSnapshot: Snapshot | undefined;

constructor(
snapshotId: number,
Expand All @@ -969,6 +1016,21 @@ export class Program {
this.toPath = toPath;
}

/** @internal */
setOwnedSnapshot(snapshot: Snapshot): void {
this.ownedSnapshot = snapshot;
}

[globalThis.Symbol.dispose](): void {
this.dispose();
}

async dispose(): Promise<void> {
const snapshot = this.ownedSnapshot;
this.ownedSnapshot = undefined;
await snapshot?.dispose();
}

getCompilerOptions(): CompilerOptions {
return this.project.compilerOptions;
}
Expand Down Expand Up @@ -1259,6 +1321,10 @@ export class Program {
});
return toEmitOutput(response);
}

getProject(): Project {
return this.project;
}
}

function toEmitOutput(response: ProtocolEmitOutputResponse): EmitOutput {
Expand Down
24 changes: 24 additions & 0 deletions packages/typescript/src/api/proto.generated.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ export interface APIMethodInfo {
initialize: APIMethod<null, InitializeResponse>;
updateSnapshot: APIMethod<UpdateSnapshotParams, UpdateSnapshotResponse>;
updateTemporarySnapshot: APIMethod<UpdateTemporarySnapshotParams, UpdateSnapshotResponse>;
createProgram: APIMethod<CreateProgramParams, CreateProgramResponse>;
parseCommandLine: APIMethod<ParseCommandLineParams, ConfigFileResponse>;
readConfigFile: APIMethod<ReadConfigFileParams, ReadConfigFileResponse>;
parseJsonConfigFileContent: APIMethod<ParseJsonConfigFileContentParams, ConfigFileResponse>;
Expand Down Expand Up @@ -224,6 +225,18 @@ export interface UpdateTemporarySnapshotParams {
newText: string;
}

export interface CreateProgramParams {
rootFiles: readonly DocumentIdentifier[] | null;
createProgramOptions: CreateProgramOptions;
oldProgram?: CreateProgramOldProgramParams;
fileChanges?: APIFileChanges;
}

export interface CreateProgramResponse {
snapshot: number;
project: ProjectResponse | null;
}

export interface ParseCommandLineParams {
commandLine: readonly string[] | null;
}
Expand Down Expand Up @@ -888,6 +901,17 @@ export interface SnapshotChanges {
removedProjects?: string[];
}

export interface CreateProgramOptions {
compilerOptions: CompilerOptions;
projectReferences?: ProjectReference[];
configFileParsingDiagnostics?: DiagnosticResponse[];
}

export interface CreateProgramOldProgramParams {
snapshot?: number;
project?: string;
}

/** CompilerOptions contains the compiler options exposed by the API. */
export interface CompilerOptions {
allowJs?: boolean;
Expand Down
80 changes: 73 additions & 7 deletions packages/typescript/src/api/sync/api.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,10 @@ import {
toPath,
} from "../path.ts";
import type {
APIFileChanges,
CompilerOptions,
CreateProgramOptions,
CreateProgramResponse,
Diagnostic,
DocumentIdentifier,
DocumentPosition,
Expand Down Expand Up @@ -143,6 +146,7 @@ import type {
export { documentURIToFileName, fileNameToDocumentURI } from "../path.ts";
export { CheckFlags, CompletionItemKind, DiagnosticCategory, ElementFlags, EmitOnly, ModifierFlags, ModuleKind, NodeBuilderFlags, ObjectFlags, SignatureFlags, SignatureKind, SymbolFlags, TypeFlags, TypeFormatFlags, TypePredicateKind };
export type {
APIFileChanges,
APIImportAdderAction as ImportAdderAction,
APIOptions,
AssertsIdentifierTypePredicate,
Expand All @@ -156,6 +160,7 @@ export type {
CompletionInfo,
CompletionOptions,
ConditionalType,
CreateProgramOptions,
Diagnostic,
DocumentIdentifier,
DocumentPosition,
Expand Down Expand Up @@ -395,6 +400,46 @@ export class API<FromLSP extends boolean = false> {
resetTimingInfo(): void {
return this.client.resetTimingInfo();
}

/**
* Creates a program from current filesystem state, or derives one from oldProgram after applying fileChanges.
*/
createProgram(
rootFiles: readonly DocumentIdentifier[],
createProgramOptions: CreateProgramOptions,
oldProgram?: Program,
fileChanges?: APIFileChanges,
): Program {
this.ensureInitialized();

if (fileChanges && !oldProgram) {
throw new Error("fileChanges requires an oldProgram");
}

const data: CreateProgramResponse = this.client.apiRequest("createProgram", {
rootFiles,
createProgramOptions,
...(oldProgram ? { oldProgram: { snapshot: oldProgram.snapshotId, project: oldProgram.getProject().id } } : {}),
...(fileChanges ? { fileChanges } : {}),
Comment on lines +419 to +423
});
if (!data.project) {
throw new Error("createProgram did not return a project");
}
const snapshot = new Snapshot(
{ snapshot: data.snapshot, projects: [data.project] },
this.client,
this.sourceFileCache,
this.toPath!,
() => {
this.activeSnapshots.delete(snapshot);
this.sourceFileCache.releaseSnapshot(snapshot.id);
},
);
const program = snapshot.getProjects()[0].program;
program.setOwnedSnapshot(snapshot);
this.activeSnapshots.add(snapshot);
return program;
}
}

export class InternalAPI {
Expand Down Expand Up @@ -955,13 +1000,15 @@ export class LanguageService {
}

export class Program {
private snapshotId: number;
private project: Project;
private client: Client;
private sourceFileCache: SourceFileCache;
private toPath: (fileName: string) => Path;
private decoder = new Wtf8Decoder();
private sourceFileMetadataCache = new Map<Path, SourceFileMetadata | undefined>();
/** @internal */
readonly snapshotId: number;
private readonly project: Project;
private readonly client: Client;
private readonly sourceFileCache: SourceFileCache;
private readonly toPath: (fileName: string) => Path;
private readonly decoder = new Wtf8Decoder();
private readonly sourceFileMetadataCache = new Map<Path, SourceFileMetadata | undefined>();
private ownedSnapshot: Snapshot | undefined;

constructor(
snapshotId: number,
Expand All @@ -977,6 +1024,21 @@ export class Program {
this.toPath = toPath;
}

/** @internal */
setOwnedSnapshot(snapshot: Snapshot): void {
this.ownedSnapshot = snapshot;
}

[globalThis.Symbol.dispose](): void {
this.dispose();
}

dispose(): void {
const snapshot = this.ownedSnapshot;
this.ownedSnapshot = undefined;
snapshot?.dispose();
}

getCompilerOptions(): CompilerOptions {
return this.project.compilerOptions;
}
Expand Down Expand Up @@ -1267,6 +1329,10 @@ export class Program {
});
return toEmitOutput(response);
}

getProject(): Project {
return this.project;
}
}

function toEmitOutput(response: ProtocolEmitOutputResponse): EmitOutput {
Expand Down
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