Function ssrCodegenTransform

packages/compiler-ssr/src/ssrCodegenTransform.ts:38–76

(
  ast: RootNode,
  options: CompilerOptions,
)

// passing it to codegen.

export function ssrCodegenTransform(
  ast: RootNode,
  options: CompilerOptions,
): void {
  const context = createSSRTransformContext(ast, options)

  // inject SFC <style> CSS variables
  // we do this instead of inlining the expression to ensure the vars are
  // only resolved once per render
  if (options.ssrCssVars) {
    const cssContext = createTransformContext(createRoot([]), options)
    const varsExp = processExpression(
      createSimpleExpression(options.ssrCssVars, false),
      cssContext,
    )
    context.body.push(
      createCompoundExpression([`const _cssVars = { style: `, varsExp, `}`]),
    )
    Array.from(cssContext.helpers.keys()).forEach(helper => {
      ast.helpers.add(helper)
    })
  }

  const isFragment =
    ast.children.length > 1 && ast.children.some(c => !isText(c))
  processChildren(ast, context, isFragment)
  ast.codegenNode = createBlockStatement(context.body)

  // Finalize helpers.
  // We need to separate helpers imported from 'vue' vs. '@vue/server-renderer'
  ast.ssrHelpers = Array.from(
    new Set([
      ...Array.from(ast.helpers).filter(h => h in ssrHelpers),
      ...context.helpers,
    ]),
  )

  ast.helpers = new Set(Array.from(ast.helpers).filter(h => !(h in ssrHelpers)))
}

export interface SSRTransformContext {
  root: RootNode