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Identical blocks of code found in 2 locations. Consider refactoring.
Open

  if (prevEnd < prevStart) {
    if (newStart <= newEnd) {
      let node;
      const mode = afterNode ? 1 : 0;
      while (newStart <= newEnd) {
Severity: Major
Found in src/reconcile/non-keyed.ts and 1 other location - About 3 hrs to fix
src/reconcile/keyed.ts on lines 176..189

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 108.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

export const reconcile = <T extends any[], N extends Node>(
  parent: Element,
  renderedValues: any[],
  data: any[],
  createFn: (...args: T) => N,
Severity: Major
Found in src/reconcile/non-keyed.ts and 1 other location - About 2 hrs to fix
src/reconcile/reuse-nodes.ts on lines 8..73

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 90.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

export const reconcile = <T extends any[], N extends Node>(
  parent: Element,
  renderedValues: any[],
  data: any[],
  createFn: (...args: T) => N,
Severity: Major
Found in src/reconcile/reuse-nodes.ts and 1 other location - About 2 hrs to fix
src/reconcile/non-keyed.ts on lines 27..282

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 90.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

    while (a === b) {
      // @ts-expect-error - FIXME:!
      updateFn(prevEndNode, b);
      prevEnd--;
      newEnd--;
Severity: Major
Found in src/reconcile/non-keyed.ts and 1 other location - About 2 hrs to fix
src/reconcile/keyed.ts on lines 103..114

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 87.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

    while (a[key] === b[key]) {
      // @ts-expect-error - FIXME:!
      updateFn(prevEndNode, b);
      prevEnd--;
      newEnd--;
Severity: Major
Found in src/reconcile/keyed.ts and 1 other location - About 2 hrs to fix
src/reconcile/non-keyed.ts on lines 102..113

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 87.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

    while (a[key] === b[key]) {
      // @ts-expect-error - FIXME:!
      updateFn(prevStartNode, b);
      prevStart++;
      newStart++;
Severity: Major
Found in src/reconcile/keyed.ts and 1 other location - About 2 hrs to fix
src/reconcile/non-keyed.ts on lines 88..98

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 84.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

    while (a === b) {
      // @ts-expect-error - FIXME:!
      updateFn(prevStartNode, b);
      prevStart++;
      newStart++;
Severity: Major
Found in src/reconcile/non-keyed.ts and 1 other location - About 2 hrs to fix
src/reconcile/keyed.ts on lines 89..99

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 84.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Function reconcile has 42 lines of code (exceeds 25 allowed). Consider refactoring.
Open

export const reconcile = <T extends any[], N extends Node>(
  parent: Element,
  renderedValues: any[],
  data: any[],
  createFn: (...args: T) => N,
Severity: Minor
Found in src/reconcile/reuse-nodes.ts - About 1 hr to fix

    Function onNodeRemove has a Cognitive Complexity of 9 (exceeds 5 allowed). Consider refactoring.
    Open

    export const onNodeRemove = (node: Node, fn: () => void): void => {
  new MutationObserver((mutations, observer) => {
    for (const mutation of mutations) {
      for (const removedNode of mutation.removedNodes) {
        if (removedNode.contains(node)) {
    Severity: Minor
    Found in src/utils.ts - About 55 mins to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Function longestPositiveIncreasingSubsequence has a Cognitive Complexity of 9 (exceeds 5 allowed). Consider refactoring.
    Open

    const longestPositiveIncreasingSubsequence = (ns: any[], newStart: number) => {
  const seq = [];
  const is = [];
  let l = -1;
  const pre = new Array(ns.length);
    Severity: Minor
    Found in src/reconcile/non-keyed.ts - About 55 mins to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Function longestPositiveIncreasingSubsequence has a Cognitive Complexity of 9 (exceeds 5 allowed). Consider refactoring.
    Open

    const longestPositiveIncreasingSubsequence = (ns: any[], newStart: number) => {
  const seq = [];
  const is = [];
  let l = -1;
  const pre = new Array(ns.length);
    Severity: Minor
    Found in src/reconcile/keyed.ts - About 55 mins to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Identical blocks of code found in 2 locations. Consider refactoring.
    Open

      for (let i = prevStart; i <= prevEnd; i++) {
    nodes[i] = tmpC;
    // @ts-expect-error - FIXME:!
    tmpC = tmpC.nextSibling;
  }
    Severity: Minor
    Found in src/reconcile/non-keyed.ts and 1 other location - About 40 mins to fix
    src/reconcile/keyed.ts on lines 250..254

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 49.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Identical blocks of code found in 2 locations. Consider refactoring.
    Open

      for (let i = prevStart; i <= prevEnd; i++) {
    nodes[i] = tmpC;
    // @ts-expect-error - FIXME:!
    tmpC = tmpC.nextSibling;
  }
    Severity: Minor
    Found in src/reconcile/keyed.ts and 1 other location - About 40 mins to fix
    src/reconcile/non-keyed.ts on lines 249..253

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 49.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Identical blocks of code found in 2 locations. Consider refactoring.
    Open

      for (let i = 0; i < toRemove.length; i++) {
    // @ts-expect-error - FIXME:!
    parent.removeChild(nodes[toRemove[i]]);
  }
    Severity: Minor
    Found in src/reconcile/keyed.ts and 1 other location - About 40 mins to fix
    src/reconcile/non-keyed.ts on lines 255..258

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 48.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Identical blocks of code found in 2 locations. Consider refactoring.
    Open

      for (let i = 0; i < toRemove.length; i++) {
    // @ts-expect-error - FIXME:!
    parent.removeChild(nodes[toRemove[i]]);
  }
    Severity: Minor
    Found in src/reconcile/non-keyed.ts and 1 other location - About 40 mins to fix
    src/reconcile/keyed.ts on lines 256..259

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 48.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Avoid too many return statements within this function.
    Open

        return;
    Severity: Major
    Found in src/reconcile/keyed.ts - About 30 mins to fix

      Avoid too many return statements within this function.
      Open

          return;
      Severity: Major
      Found in src/reconcile/non-keyed.ts - About 30 mins to fix

        Function findGreatestIndexLEQ has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.
        Open

        const findGreatestIndexLEQ = (seq: any[], n: number) => {
  // invariant: lo is guaranteed to be index of a value <= n, hi to be >
  // therefore, they actually start out of range: (-1, last + 1)
  let lo = -1;
  let hi = seq.length;
        Severity: Minor
        Found in src/reconcile/keyed.ts - About 25 mins to fix

        Cognitive Complexity

        Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

        A method's cognitive complexity is based on a few simple rules:

        • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
        • Code is considered more complex for each "break in the linear flow of the code"
        • Code is considered more complex when "flow breaking structures are nested"

        Further reading

        Function findGreatestIndexLEQ has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.
        Open

        const findGreatestIndexLEQ = (seq: any[], n: number) => {
  // invariant: lo is guaranteed to be index of a value <= n, hi to be >
  // therefore, they actually start out of range: (-1, last + 1)
  let lo = -1;
  let hi = seq.length;
        Severity: Minor
        Found in src/reconcile/non-keyed.ts - About 25 mins to fix

        Cognitive Complexity

        Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

        A method's cognitive complexity is based on a few simple rules:

        • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
        • Code is considered more complex for each "break in the linear flow of the code"
        • Code is considered more complex when "flow breaking structures are nested"

        Further reading

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