@azure-tools/typespec-azure-resource-manager/dist/src/rules/arm-resource-duplicate-property.js

TypeSpec Azure Resource Manager library

import { createRule, getProperty, paramMessage } from "@typespec/compiler";
import { getArmResource } from "../resource.js";
export const armResourceDuplicatePropertiesRule = createRule({
    name: "arm-resource-duplicate-property",
    severity: "warning",
    description: "Warn about duplicate properties in resources.",
    messages: {
        default: paramMessage `Duplicate property "${"propertyName"}" found in the resource envelope and resource properties.  Please do not duplicate envelope properties in resource properties.`,
    },
    create(context) {
        return {
            model: (model) => {
                const resourceModel = getArmResource(context.program, model);
                const reportedDup = new Set();
                if (resourceModel !== undefined) {
                    const resourceProperties = getProperty(model, "properties")?.type;
                    for (const property of getProperties(model)) {
                        if (resourceProperties !== undefined && resourceProperties.kind === "Model") {
                            const targetProperty = getProperty(resourceProperties, property.name);
                            if (targetProperty !== undefined && !reportedDup.has(property.name)) {
                                context.reportDiagnostic({
                                    format: { propertyName: property.name },
                                    target: targetProperty,
                                });
                                reportedDup.add(property.name);
                            }
                        }
                    }
                }
            },
        };
        function getProperties(model) {
            const result = [];
            let current = model;
            while (current !== undefined) {
                if (current.properties.size > 0)
                    result.push(...current.properties.values());
                current = current.baseModel;
            }
            return result;
        }
    },
});
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