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codegenInstructionNullable() — react Function Reference

Architecture documentation for the codegenInstructionNullable() function in CodegenReactiveFunction.ts from the react codebase.

Function typescript BabelCompiler Validation calls 10 called by 1

Entity Profile

Dependency Diagram

graph TD
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d["codegenInstructionNullable()"]
  dc7f10c2_c914_a162_d02b_a10a15c64a5f["CodegenReactiveFunction.ts"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|defined in| dc7f10c2_c914_a162_d02b_a10a15c64a5f
  6913ca73_f3c4_9919_bf65_7b95559378b7["codegenBlockNoReset()"]
  6913ca73_f3c4_9919_bf65_7b95559378b7 -->|calls| c65f3ebd_fe8f_602d_b885_bc79e6e81b1d
  43b28878_9b1d_6aeb_0d77_25080004044d["hasDeclared()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| 43b28878_9b1d_6aeb_0d77_25080004044d
  0b424541_28a8_fc42_ac4b_b6ae2672cb88["codegenPlaceToExpression()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| 0b424541_28a8_fc42_ac4b_b6ae2672cb88
  f5637d03_fd91_50b8_9da7_b2a24c91bab7["eachPatternOperand()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| f5637d03_fd91_50b8_9da7_b2a24c91bab7
  041ca752_10c1_3cda_1f5c_02f44a01310e["invariant()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| 041ca752_10c1_3cda_1f5c_02f44a01310e
  6a903108_0a0b_6e52_019e_0b534b909b09["createVariableDeclarator()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| 6a903108_0a0b_6e52_019e_0b534b909b09
  fa00221c_3f87_f634_2655_5b0ca5860306["codegenLValue()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| fa00221c_3f87_f634_2655_5b0ca5860306
  1bdf9e01_ffb0_1422_a451_e62965a1969b["printInstruction()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| 1bdf9e01_ffb0_1422_a451_e62965a1969b
  e98029e7_d319_5eee_1233_4a0434b62d22["codegenInstruction()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| e98029e7_d319_5eee_1233_4a0434b62d22
  d7fde76c_4fd9_feb3_299b_798689f05bc6["assertExhaustive()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| d7fde76c_4fd9_feb3_299b_798689f05bc6
  d8edf87e_ea78_c9d0_b5c9_13d68891efec["codegenInstructionValue()"]
  c65f3ebd_fe8f_602d_b885_bc79e6e81b1d -->|calls| d8edf87e_ea78_c9d0_b5c9_13d68891efec
  style c65f3ebd_fe8f_602d_b885_bc79e6e81b1d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/CodegenReactiveFunction.ts lines 1227–1380

function codegenInstructionNullable(
  cx: Context,
  instr: ReactiveInstruction,
): t.Statement | null {
  if (
    instr.value.kind === 'StoreLocal' ||
    instr.value.kind === 'StoreContext' ||
    instr.value.kind === 'Destructure' ||
    instr.value.kind === 'DeclareLocal' ||
    instr.value.kind === 'DeclareContext'
  ) {
    let kind: InstructionKind = instr.value.lvalue.kind;
    let lvalue: Place | Pattern;
    let value: t.Expression | null;
    if (instr.value.kind === 'StoreLocal') {
      kind = cx.hasDeclared(instr.value.lvalue.place.identifier)
        ? InstructionKind.Reassign
        : kind;
      lvalue = instr.value.lvalue.place;
      value = codegenPlaceToExpression(cx, instr.value.value);
    } else if (instr.value.kind === 'StoreContext') {
      lvalue = instr.value.lvalue.place;
      value = codegenPlaceToExpression(cx, instr.value.value);
    } else if (
      instr.value.kind === 'DeclareLocal' ||
      instr.value.kind === 'DeclareContext'
    ) {
      if (cx.hasDeclared(instr.value.lvalue.place.identifier)) {
        return null;
      }
      kind = instr.value.lvalue.kind;
      lvalue = instr.value.lvalue.place;
      value = null;
    } else {
      lvalue = instr.value.lvalue.pattern;
      for (const place of eachPatternOperand(lvalue)) {
        if (
          kind !== InstructionKind.Reassign &&
          place.identifier.name === null
        ) {
          cx.temp.set(place.identifier.declarationId, null);
        }
      }
      value = codegenPlaceToExpression(cx, instr.value.value);
    }
    switch (kind) {
      case InstructionKind.Const: {
        CompilerError.invariant(instr.lvalue === null, {
          reason: `Const declaration cannot be referenced as an expression`,
          message: `this is ${kind}`,
          loc: instr.value.loc,
        });
        return createVariableDeclaration(instr.loc, 'const', [
          createVariableDeclarator(codegenLValue(cx, lvalue), value),
        ]);
      }
      case InstructionKind.Function: {
        CompilerError.invariant(instr.lvalue === null, {
          reason: `Function declaration cannot be referenced as an expression`,
          loc: instr.value.loc,
        });
        const genLvalue = codegenLValue(cx, lvalue);
        CompilerError.invariant(genLvalue.type === 'Identifier', {
          reason: 'Expected an identifier as a function declaration lvalue',
          loc: instr.value.loc,
        });
        CompilerError.invariant(value?.type === 'FunctionExpression', {
          reason: 'Expected a function as a function declaration value',
          description: `Got ${value == null ? String(value) : value.type} at ${printInstruction(instr)}`,
          loc: instr.value.loc,
        });
        return createFunctionDeclaration(
          instr.loc,
          genLvalue,
          value.params,
          value.body,
          value.generator,
          value.async,
        );
      }
      case InstructionKind.Let: {

Domain

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Source

Frequently Asked Questions

What does codegenInstructionNullable() do?
codegenInstructionNullable() is a function in the react codebase, defined in compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/CodegenReactiveFunction.ts.
Where is codegenInstructionNullable() defined?
codegenInstructionNullable() is defined in compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/CodegenReactiveFunction.ts at line 1227.
What does codegenInstructionNullable() call?
codegenInstructionNullable() calls 10 function(s): assertExhaustive, codegenInstruction, codegenInstructionValue, codegenLValue, codegenPlaceToExpression, createVariableDeclarator, eachPatternOperand, hasDeclared, and 2 more.
What calls codegenInstructionNullable()?
codegenInstructionNullable() is called by 1 function(s): codegenBlockNoReset.

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