browser-basedpyright

import { createLanguageService, createInMemoryLanguageServiceHost, type LanguageService } from 'browser-basedpyright'; // --- Setup the host for the language service --- // This host simulates a file system and provides content for the language service. const pythonCode = ` class MyClass: def __init__(self, name: str): self.name = name def greet(self) -> str: return f"Hello, {self.name}!" def process_data(value: int): # This should be flagged if 'value' is not an int or if 'value' is a str if value == "test": # This will cause a pyright warning print("Test string") obj = MyClass("World") print(obj.greet()) process_data(123) process_data("hello") # Pyright should flag this as type error `; const virtualFilePath = '/src/main.py'; const host = createInMemoryLanguageServiceHost({ getOpenFileContents: (path: string) => { if (path === virtualFilePath) { return pythonCode; } return undefined; // Or throw error for unknown files }, getWorkspaceFiles: () => [virtualFilePath], getPythonVersion: () => '3.10', getPyrightConfig: () => ({ reportMissingImports: "warning", reportUnknownMemberType: "warning" }), }); // --- Initialize the language service --- const service: LanguageService = createLanguageService(host); // --- Get diagnostics for the file --- async function getAndPrintDiagnostics() { const diagnostics = await service.getDiagnostics(virtualFilePath); console.log(`Diagnostics for ${virtualFilePath}:`); if (diagnostics.length === 0) { console.log("No issues found."); } else { diagnostics.forEach(d => { console.log(` [${d.severity}] ${d.message} at line ${d.range.start.line + 1}, col ${d.range.start.character + 1}`); }); } } getAndPrintDiagnostics(); // Example of updating content and re-checking setTimeout(async () => { const updatedCode = ` class AnotherClass: def say_hi(self): print("Hi!") another_obj = AnotherClass() another_obj.say_hi() # Fix the previous error def process_data_fixed(value: int): if value == 1: print("One") process_data_fixed(42) # process_data_fixed("oops") // This would still be an error if uncommented `; host.setOpenFileContents(virtualFilePath, updatedCode); console.log("\n--- Updated code and re-checking ---"); await getAndPrintDiagnostics(); }, 2000);