message: Use appropriate case
diff: @@ -13,19 +13,19 @@ async function extractVariable(
  editor: Editor
  ) {
  const {
  - selected_occurrence,
  - other_occurrences,
  + selectedOccurrence,
  + otherOccurrences,
  parseId,
  parseCode
  } = findExtractableCode(code, selection);
  - const { path, loc } = selected_occurrence;
  + const { path, loc } = selectedOccurrence;
  if (!path || !loc) {
  editor.showError(ErrorReason.DidNotFoundExtractableCode);
  return;
  }
  - const occurrencesCount = other_occurrences.length;
  + const occurrencesCount = otherOccurrences.length;
  if (occurrencesCount > 0) {
  const choice = await editor.askUser([
  {
  @@ -82,11 +82,11 @@ function findExtractableCode(
  selection: Selection
  ): ExtractableCode {
  let result: ExtractableCode = {
  - selected_occurrence: {
  + selectedOccurrence: {
  path: undefined,
  loc: null
  },
  - other_occurrences: [],
  + otherOccurrences: [],
  parseId: id => id,
  parseCode: code => code
  };
  @@ -109,12 +109,12 @@ function findExtractableCode(
  const { node } = path;
  if (!selection.isInsideNode(node)) return;
  - result.selected_occurrence.path = path;
  - result.selected_occurrence.loc = ast.isObjectProperty(node)
  + result.selectedOccurrence.path = path;
  + result.selectedOccurrence.loc = ast.isObjectProperty(node)
  ? findObjectPropertyLoc(selection, node) ||
  - result.selected_occurrence.loc
  + result.selectedOccurrence.loc
  : ast.isJSXExpressionContainer(node)
  - ? node.expression.loc || result.selected_occurrence.loc
  + ? node.expression.loc || result.selectedOccurrence.loc
  : node.loc;
  result.parseId =
  @@ -129,7 +129,7 @@ function findExtractableCode(
  }
  });
  - const foundPath = result.selected_occurrence.path;
  + const foundPath = result.selectedOccurrence.path;
  if (foundPath) {
  ast.traverseAST(code, {
  enter(path) {
  @@ -147,7 +147,7 @@ function findExtractableCode(
  ast.isStringLiteral(foundPath.node) &&
  path.node.value === foundPath.node.value
  ) {
  - result.other_occurrences.push({
  + result.otherOccurrences.push({
  path,
  loc: path.node.loc
  });
  @@ -208,8 +208,8 @@ function isPartOfMemberExpression(path: ast.NodePath): boolean {
  }
  type ExtractableCode = {
  - selected_occurrence: Occurrence;
  - other_occurrences: Occurrence[];
  + selectedOccurrence: Occurrence;
  + otherOccurrences: Occurrence[];
  parseId: (id: Code) => Code;
  parseCode: (code: Code) => Code;
  };
  