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152 changes: 152 additions & 0 deletions
152
packages/next/src/server/typescript/rules/server-boundary.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| // This module provides intellisense for all exports from `"use server"` directive. | ||
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|
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| import { NEXT_TS_ERRORS } from '../constant' | ||
| import { getTs, getTypeChecker } from '../utils' | ||
| import type tsModule from 'typescript/lib/tsserverlibrary' | ||
|
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| // Check if the type is `Promise<T>`. | ||
| function isPromiseType(type: tsModule.Type, typeChecker: tsModule.TypeChecker) { | ||
| const typeReferenceType = type as tsModule.TypeReference | ||
| if (!typeReferenceType.target) return false | ||
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| // target should be Promise or Promise<...> | ||
| if ( | ||
| !/^Promise(<.+>)?$/.test(typeChecker.typeToString(typeReferenceType.target)) | ||
| ) { | ||
| return false | ||
| } | ||
|
|
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| return true | ||
| } | ||
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| function isFunctionReturningPromise( | ||
| node: tsModule.Node, | ||
| typeChecker: tsModule.TypeChecker, | ||
| ts: typeof tsModule | ||
| ) { | ||
| const type = typeChecker.getTypeAtLocation(node) | ||
| const signatures = typeChecker.getSignaturesOfType( | ||
| type, | ||
| ts.SignatureKind.Call | ||
| ) | ||
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| let isPromise = true | ||
| if (signatures.length) { | ||
| for (const signature of signatures) { | ||
| const returnType = signature.getReturnType() | ||
| if (returnType.isUnion()) { | ||
| for (const t of returnType.types) { | ||
| if (!isPromiseType(t, typeChecker)) { | ||
| isPromise = false | ||
| break | ||
| } | ||
| } | ||
| } else { | ||
| isPromise = isPromiseType(returnType, typeChecker) | ||
| } | ||
| } | ||
| } else { | ||
| isPromise = false | ||
| } | ||
|
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| return isPromise | ||
| } | ||
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| const serverBoundary = { | ||
| getSemanticDiagnosticsForExportDeclaration( | ||
| source: tsModule.SourceFile, | ||
| node: tsModule.ExportDeclaration | ||
| ) { | ||
| const ts = getTs() | ||
| const typeChecker = getTypeChecker() | ||
| if (!typeChecker) return [] | ||
|
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| const diagnostics: tsModule.Diagnostic[] = [] | ||
|
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| const exportClause = node.exportClause | ||
| if (exportClause && ts.isNamedExports(exportClause)) { | ||
| for (const e of exportClause.elements) { | ||
| if (!isFunctionReturningPromise(e, typeChecker, ts)) { | ||
| diagnostics.push({ | ||
| file: source, | ||
| category: ts.DiagnosticCategory.Error, | ||
| code: NEXT_TS_ERRORS.INVALID_SERVER_ENTRY_RETURN, | ||
| messageText: `The "use server" file can only export async functions.`, | ||
| start: e.getStart(), | ||
| length: e.getWidth(), | ||
| }) | ||
| } | ||
| } | ||
| } | ||
|
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| return diagnostics | ||
| }, | ||
|
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| getSemanticDiagnosticsForExportVariableStatement( | ||
| source: tsModule.SourceFile, | ||
| node: tsModule.VariableStatement | ||
| ) { | ||
| const ts = getTs() | ||
|
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| const diagnostics: tsModule.Diagnostic[] = [] | ||
|
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| if (ts.isVariableDeclarationList(node.declarationList)) { | ||
| for (const declaration of node.declarationList.declarations) { | ||
| const initializer = declaration.initializer | ||
| if ( | ||
| initializer && | ||
| (ts.isArrowFunction(initializer) || | ||
| ts.isFunctionDeclaration(initializer) || | ||
| ts.isFunctionExpression(initializer)) | ||
| ) { | ||
| diagnostics.push( | ||
| ...serverBoundary.getSemanticDiagnosticsForFunctionExport( | ||
| source, | ||
| initializer | ||
| ) | ||
| ) | ||
| } else { | ||
| diagnostics.push({ | ||
| file: source, | ||
| category: ts.DiagnosticCategory.Error, | ||
| code: NEXT_TS_ERRORS.INVALID_SERVER_ENTRY_RETURN, | ||
| messageText: `The "use server" file can only export async functions.`, | ||
| start: declaration.getStart(), | ||
| length: declaration.getWidth(), | ||
| }) | ||
| } | ||
| } | ||
| } | ||
|
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| return diagnostics | ||
| }, | ||
|
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| getSemanticDiagnosticsForFunctionExport( | ||
| source: tsModule.SourceFile, | ||
| node: | ||
| | tsModule.FunctionDeclaration | ||
| | tsModule.ArrowFunction | ||
| | tsModule.FunctionExpression | ||
| ) { | ||
| const ts = getTs() | ||
| const typeChecker = getTypeChecker() | ||
| if (!typeChecker) return [] | ||
|
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| const diagnostics: tsModule.Diagnostic[] = [] | ||
|
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| if (!isFunctionReturningPromise(node, typeChecker, ts)) { | ||
| diagnostics.push({ | ||
| file: source, | ||
| category: ts.DiagnosticCategory.Error, | ||
| code: NEXT_TS_ERRORS.INVALID_SERVER_ENTRY_RETURN, | ||
| messageText: `The "use server" file can only export async functions. Add "async" to the function declaration or return a Promise.`, | ||
| start: node.getStart(), | ||
| length: node.getWidth(), | ||
| }) | ||
| } | ||
|
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| return diagnostics | ||
| }, | ||
| } | ||
|
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| export default serverBoundary |
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