private _checkForRuntimeHammerUsage()

in src/material/schematics/ng-update/migrations/hammer-gestures-v9/hammer-gestures-migration.ts [429:473]

• 38 lines of code
• 18 McCabe index (conditional complexity)

  private _checkForRuntimeHammerUsage(node: ts.Node) {
    if (this._usedInRuntime) {
      return;
    }

    // Detects usages of "window.Hammer".
    if (ts.isPropertyAccessExpression(node) && node.name.text === 'Hammer') {
      const originExpr = unwrapExpression(node.expression);
      if (ts.isIdentifier(originExpr) && originExpr.text === 'window') {
        this._usedInRuntime = true;
      }
      return;
    }

    // Detects usages of "window['Hammer']".
    if (
      ts.isElementAccessExpression(node) &&
      ts.isStringLiteral(node.argumentExpression) &&
      node.argumentExpression.text === 'Hammer'
    ) {
      const originExpr = unwrapExpression(node.expression);
      if (ts.isIdentifier(originExpr) && originExpr.text === 'window') {
        this._usedInRuntime = true;
      }
      return;
    }

    // Handles usages of plain identifier with the name "Hammer". These usage
    // are valid if they resolve to "@types/hammerjs". e.g. "new Hammer(myElement)".
    if (
      ts.isIdentifier(node) &&
      node.text === 'Hammer' &&
      !ts.isPropertyAccessExpression(node.parent) &&
      !ts.isElementAccessExpression(node.parent)
    ) {
      const symbol = this._getDeclarationSymbolOfNode(node);
      if (
        symbol &&
        symbol.valueDeclaration &&
        symbol.valueDeclaration.getSourceFile().fileName.includes('@types/hammerjs')
      ) {
        this._usedInRuntime = true;
      }
    }
  }