Fix Library.init() Modernization

This skill fixes Library.init() / Lib.init() calls that the UI5 linter detects as missing apiVersion: 2, and modernizes enum definitions to use DataType.registerEnum — which is required when using apiVersion: 2.

Linter Rules Handled

When to Use

Apply this skill when you see linter output like:

library.js:9:2 error Deprecated call to Library.init(). Use the {apiVersion: 2} parameter instead  no-deprecated-api
library.js:11:2 error Deprecated call to Lib.init(). Use the {apiVersion: 2} parameter instead  no-deprecated-api
library.js:51:2 error Deprecated call to init(). Use the {apiVersion: 2} parameter instead  no-deprecated-api

Background: What Library.init() Does

sap/ui/core/Lib.init() registers a UI5 library with the framework, declaring its metadata: name, dependencies, controls, elements, types (enums), and interfaces. The apiVersion: 2 parameter signals that the library uses the modern initialization pattern.

Important: Only apiVersion: 2 is valid for Lib.init(). Unlike control renderers where apiVersion: 4 is also valid, library initialization only accepts 2.

Fix Strategy

1. No Arguments

Problem: Lib.init() called with no arguments at all.

// Before — triggers no-deprecated-api
sap.ui.define([
    "sap/ui/core/Lib"
], function(Library) {
    "use strict";

    Library.init();
});

Fix: Add an object argument with apiVersion: 2.

// After
sap.ui.define([
    "sap/ui/core/Lib"
], function(Library) {
    "use strict";

    Library.init({
        apiVersion: 2
    });
});

2. Object Argument Without apiVersion

Problem: Lib.init() receives an object but it has no apiVersion property.

// Before — triggers no-deprecated-api
Library.init({
    name: "my.lib",
    dependencies: ["sap.ui.core", "sap.m"]
});

Fix: Add apiVersion: 2 as the first property in the object.

// After
Library.init({
    apiVersion: 2,
    name: "my.lib",
    dependencies: ["sap.ui.core", "sap.m"]
});

3. apiVersion Is Not a Number

Problem: apiVersion is a string instead of a numeric literal.

// Before — triggers no-deprecated-api
Library.init({
    apiVersion: "2"
});

Fix: Change to numeric literal 2.

// After
Library.init({
    apiVersion: 2
});

4. apiVersion Is Wrong Number

Problem: apiVersion is a number but not 2.

// Before — triggers no-deprecated-api
Library.init({
    apiVersion: 1
});

Fix: Change to 2.

// After
Library.init({
    apiVersion: 2
});

5. Element Access Syntax

The same patterns apply when init is called via bracket notation:

// Before
Library["init"]({
    apiVersion: 1,
    dependencies: ["sap.ui.core"]
});

// After
Library["init"]({
    apiVersion: 2,
    dependencies: ["sap.ui.core"]
});

6. Destructured or Assigned init

The linter also detects these patterns:

// Assignment
const LibInit = Library.init;
LibInit({ apiVersion: 1 });

// Destructuring
const {init} = Library;
init({ apiVersion: 1 });

// Destructuring with rename
const {init: libInit} = Library;
libInit({ apiVersion: 1 });

Fix: Same — change apiVersion to 2 in each call.

Modernize Enums to DataType.registerEnum

When upgrading Lib.init() to apiVersion: 2, the old approach of defining enums on the global namespace no longer works. The framework cannot resolve type strings used in control metadata without explicit registration, which can lead to XSS vulnerabilities because type checking is silently skipped.

This skill must find existing enum definitions in the library.js and modernize them to use DataType.registerEnum.

How to Find Enums

1. Check the types array in the Lib.init() call — it lists the fully qualified names of all types (enums) defined by the library
2. Search for global namespace assignments — e.g. my.lib.ValueColor = { ... } where my.lib is the library namespace
3. Look for existing enum objects defined as plain objects with string key-value pairs

Modernization Steps

1. Capture the return value of Lib.init() in a variable if not already done:

   // Before
   Library.init({ name: "my.lib", apiVersion: 2, types: ["my.lib.ValueColor"] });
   
   // After
   var oThisLibrary = Library.init({ name: "my.lib", apiVersion: 2, types: ["my.lib.ValueColor"] });
   

2. Move enum definitions from the global namespace to the library object:

   // Before — global namespace
   my.lib.ValueColor = { Color1: "Color1", Color2: "Color2" };
   
   // After — on library object
   oThisLibrary.ValueColor = { Color1: "Color1", Color2: "Color2" };
   

3. Add DataType.registerEnum call immediately after each enum definition:

   oThisLibrary.ValueColor = { Color1: "Color1", Color2: "Color2" };
   DataType.registerEnum("my.lib.ValueColor", oThisLibrary.ValueColor);
   

4. Add sap/ui/base/DataType to the sap.ui.define dependency list if not already present:

   sap.ui.define([
       "sap/ui/base/DataType",  // Add this
       "sap/ui/core/Lib"
   ], function(DataType, Library) {
   

Key Rules

• The first argument to registerEnum must exactly match the string used as type in control metadata (e.g. "my.lib.ValueColor")
• All enum definitions should stay in library.js for library preload compatibility
• Each enum listed in the types array needs its own registerEnum call

Complete Example

Before

/*!
 * ${copyright}
 */
sap.ui.define([
    "sap/ui/core/Lib"
], function(Library) {
    "use strict";

    Library.init({
        name: "my.lib",
        dependencies: ["sap.ui.core", "sap.m"],
        types: [
            "my.lib.ValueColor",
            "my.lib.StatusType"
        ],
        controls: [
            "my.lib.MyControl"
        ]
    });

    // Enums defined on global namespace
    my.lib.ValueColor = {
        Good: "Good",
        Critical: "Critical",
        Error: "Error",
        Neutral: "Neutral"
    };

    my.lib.StatusType = {
        Active: "Active",
        Inactive: "Inactive"
    };
});

After

/*!
 * ${copyright}
 */
sap.ui.define([
    "sap/ui/base/DataType",
    "sap/ui/core/Lib"
], function(DataType, Library) {
    "use strict";

    var oThisLibrary = Library.init({
        apiVersion: 2,
        name: "my.lib",
        dependencies: ["sap.ui.core", "sap.m"],
        types: [
            "my.lib.ValueColor",
            "my.lib.StatusType"
        ],
        controls: [
            "my.lib.MyControl"
        ]
    });

    oThisLibrary.ValueColor = {
        Good: "Good",
        Critical: "Critical",
        Error: "Error",
        Neutral: "Neutral"
    };
    DataType.registerEnum("my.lib.ValueColor", oThisLibrary.ValueColor);

    oThisLibrary.StatusType = {
        Active: "Active",
        Inactive: "Inactive"
    };
    DataType.registerEnum("my.lib.StatusType", oThisLibrary.StatusType);

    return oThisLibrary;
});

Implementation Steps

1. Run linter with --details to get additional context:

   npx @ui5/linter --details
   

2. Read the library.js file and identify:

   • The Lib.init() / Library.init() call and its current arguments
   • Whether the return value is captured in a variable
   • Any enum definitions (check types array and global namespace assignments)

3. Fix the apiVersion:

   • If no arguments: add { apiVersion: 2 }
   • If object without apiVersion: add apiVersion: 2 as the first property
   • If apiVersion is wrong value or type: change to numeric 2

4. Modernize enums (if any exist):

   • Capture Lib.init() return value in a variable if not already done
   • Move each enum from global namespace to the library object
   • Add DataType.registerEnum call for each enum
   • Add sap/ui/base/DataType to the dependency list

5. Ensure the module returns the library object (return oThisLibrary;)

6. Verify the fix by re-running the linter

Notes

• Only apiVersion: 2 is valid for Lib.init() — apiVersion: 4 is NOT valid (that is for renderers only)
• apiVersion must be a numeric literal, not a string
• Libraries without enums only need the apiVersion: 2 fix (no DataType.registerEnum needed)
• If the library already returns the init result and has no global enum definitions, only the apiVersion fix is needed
• The types array in the init call is your guide to which enums need registerEnum calls

Related Skills

• fix-control-renderer: For renderer apiVersion issues (missing apiVersion: 2 or 4 in renderer objects) — different from library init apiVersion
• fix-pseudo-modules: If consumer code imports enums via pseudo-modules (e.g. sap.ui.require(["my/lib/ValueColor"])), use fix-pseudo-modules to convert them to library module imports
• fix-js-globals: If library.js also has global access patterns beyond enum definitions (e.g. sap.ui.getCore()), use fix-js-globals for those