Provide type hints to monaco editor

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耶瑟儿~
耶瑟儿~ 2021-02-10 12:34

I am trying to provide intellisense / code completion into a javascript editor using the Monaco editor. The code needs to be valid javascript, not typescript.

Given some

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  • 2021-02-10 12:59

    As of Monaco version 0.90, since https://github.com/Microsoft/monaco-editor/issues/203 has been fixed, you can add achieve this partially if you use JSDoc in the editing code.

    For this code in the left side of the Monaco playgound:

        // validation settings
    monaco.languages.typescript.javascriptDefaults.setDiagnosticsOptions({
        noSemanticValidation: true,
        noSyntaxValidation: false
    });
    
    // compiler options
    monaco.languages.typescript.javascriptDefaults.setCompilerOptions({
        target: monaco.languages.typescript.ScriptTarget.ES6,
        allowNonTsExtensions: true,
        allowJs: true
    });
    
    // extra libraries
    monaco.languages.typescript.javascriptDefaults.addExtraLib([
        'declare class SomeEventType {',
        '    /**',
        '     * Heres the doco for someProperty',
        '     */',
        '    someProperty: string',
        '}',
    ].join('\n'), 'filename/facts.d.ts');
    
    var jsCode = [
        '"use strict";',
        '',
        "/**",
        " * @param {SomeEventType} event",
        " */",
        "function onMyEvent(event) {",
        "",
        "}"
    ].join('\n');
    
    monaco.editor.create(document.getElementById("container"), {
        value: jsCode,
        language: "javascript"
    });
    

    Means that the editor can now interpret the event parameter as a SomeEventType:

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  • 2021-02-10 13:02

    This is how we do it for magikcraft.io: drop this code straight into the left pane in the playground, then hit Run:

    monaco.editor.create(document.getElementById("container"), {
        value: "function hello() {\n\talert('Hello world!');\n}",
        language: "typescript"
    });
    
    const fact = `declare namespace custom { export function onMyEvent(event: customClass): void; 
    
    export class customClass { 
        customProperty: string;
    }`;
    const factFilename = 'myCustomNamespace';
    this.monaco.languages.typescript.typescriptDefaults.addExtraLib(fact, factFilename);
    

    Now, in the right pane, then type: custom. and you'll get autocomplete for the custom facts.

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  • 2021-02-10 13:10

    Put this in the editor in the Monaco Playground:

    monaco.editor.create(document.getElementById("container"), {
        value: "function hello() {\n\talert('Hello world!');\n}",
        language: "typescript"
    });
    
    const fact = `declare function onMyEvent(event: string): void; 
    `;
    const factFilename = 'myCustomNamespace1';
    this.monaco.languages.typescript.typescriptDefaults.addExtraLib(fact, factFilename);
    

    Now when you type onMyEvent in the right-hand pane, you'll get

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