The Modding Tree changelog:

v2.5.9.2 - 5/19/21

• Fixed many issues with things not updating.

v2.5.9.1 - 5/18/21

• Made text inputs never give NaNs.

v2.5.9 - 5/18/21

• Fixed issue when using text inputs for Numbers.
• Added particle color feature.
• Particle speed and dir are updated as it moves.
• Added setSpeed and setDir for particles.
• Added more trig functions.

v2.5.8 - 5/17/21

• Added makeShinies, which creates a stationary particle in a random spot.
• Bars will visually update more quickly.
• Fixed a major particle-related issue.
• Fixed autoUpgrade.
• Fixed a minor visual issue with tree nodes.

v2.5.7 - 5/15/21

• Added a particle system! Not only can it be used for visual effects, but particles can interact with the mouse. They could be used to create golden cookies or collectables, for example.
• Added marked feature to buyables, clickables, and challenges. By default, stars multi-completion challenges when maxed.
• Added 'deactivated' feature to layers, which disables many features.
• Improved number formatting slightly.

v2.5.6 - 5/14/21

• You can now use non-numeric ids for upgrades, buyables, etc.
• Fixed an exploit that let you buy an extra buyable.
• Moved basic getter/setter functions to easyAccess.js.

v2.5.5.2 - 5/12/21

• Fixed a major issue with buyables.
• Fixed a variety of tabFormat-related issues.
• Fixed commas appearing in decimal places (thanks to pg132!)

v2.5.5.1 - 5/12/21

• Fixed clickables.

v2.5.5 - 5/12/21

• Added grids! They are a grid of buttons which behave the same, but have their own data. Good for inventory grids, map tiles, and more!
• Added "marked" feature to add a mark to a node. Can be an image instead of a star. (Originally by Jacorb)
• Added "layer-proxy" component that lets you use components from another layer.
• Added the ability to display non-whole numbers in main-display.

v2.5.4 - 5/10/21

• Added a setting to always use single-tab mode.
• Added directMult, which multiplies prestige gain after exponents and softcaps. It actually multiplies gain for static layers.
• Added onEnter and onExit for challenges.
• Improved displaying numbers between 0.0001 and 0.1.
• Added documentation on how gainMult/Exp work for static layers.
• Fixed a visual issue on mobile, thanks to thepaperpilot.
• Improved documentation in general.

v2.5.3 - 5/8/21

• Improved performance of tab formats and bars.
• Respec confirmation settings are now kept on resets.
• Improved compatibility with older browsers.
• Fixed missing pixel on vertical bars.

v2.5.2.1 - 5/7/21

• Fixed microtabs making layers highlight incorrectly.

v2.5.2 - 5/7/21

• Added glowColor for subtabs.
• Improved the display for extremely small numbers.
• Fixed issues in the buyable docs.

v2.5.1 - 5/7/21

• Fixed dynamic things in tabFormat not updating.

v2.5: Dreams Really Do Come True - 5/7/21

• Optimizations, hopefully a significant amount.
• Added OOM/s point gen display at high values (thanks to Ducdat!)
• Only one tab will display if the window is not wide enough (also thanks to Ducdat!)
• Holding down a buyable's button now buys it continuously.
• New milestone setting will also show the most recently unlocked milestone. (Also renamed all settings to be clearer)
• Added an onHold feature for clickables.
• Layer nodes will be highlighted even if the player is on the same tab.
• Added customizable node glowColor.
• Added buyable purchaseLimit.
• Amount is automatically supplied to buyable cost and effect functions.
• Locked (not yet visible) milestones no longer take up space. Also fixed hidden milestones taking a tiny bit of space.
• Re-centered respec buttons.
• Force-displayed tooltips are not hidden by resets.
• Added formatting support for very small numbers. Disabled in most places by default because rounding errors might cause issues. Access it with formatSmall, or enable it globally by adding "allowSmall: true" to modInfo.

v2.4.1 - 4/29/21

• A number of minor fixes, many thanks to thepaperpilot.
• The respec confirmation checkbox is now part of the respec-button component. (This also fixes the checkbox appearing when there is no respec button)
• Added a few undocumented changes to the 2.4 changelog (the two at the bottom)

v2.4: Rationalized Edition - 4/29/21

• Completely reworked tooltips. Shift-click a node to force its tooltip to stay displayed. (And hopefully finally fixed flickering!)

• Added text-input and slider components.

• Added the ability to toggle respec confirmations.

• Added custom respec confirmation messages.

• The red layer highlight will not appear before a layer is unlocked.

• Added unlocking hotkeys.

• You no longer need to supply 'rows' and 'cols' for any Big Features.

• Node symbols can use HTML.

• Added documentation for the respec button.

• Added prestigeNotify to subtabs, and prestigeNotify in subtabs also highlights the layer node.

• The version number no longer contains special characters or irrational numbers.

• Added ctrlDown and shiftDown variables.

• Tooltips now use HTML (this means you need to replace any newlines with
  )

v2.π.1 - 4/7/21

• Fixed formatting for some larger numbers.
• Upgrades will expand if there is too much text to display.
• Fixed styling challenges.
• No longer attempts to display a base currency when there is none.

v2.π: Incrementally Updated - 2/5/21

• Performance improvements.
• Fixed tooltips overlapping with the top display.
• Clicking a popup dismisses it immediately.
• Added support for bulk challenge completions.
• "Best" is updated automatically.
• Fixed keeping Decimal values on reset.
• Code reorganization and style improvements by fudo.

v2.3.5 - 12/21/20

• Added resetTime, which tracks the time since a layer prestiged or was reset.
• A layer node will be highlighted red if one of its subtabs is highlighted red.
• Fixed issues with keeping challenges, buyables, and clickables on reset.
• Improved the unlocking of custom layers.
• Other minor fixes.

v2.3.4 - 12/16/20

• Added a node image feature.
• Resource display now always shows the amount of the currency the layer's gain is based on.
• Added spacing between tree nodes.
• Another attempt to fix tooltip flickering.

v2.3.3 - 12/13/20

• Fixed the first node in a row always taking up space.
• layerShown is now optional.
• All prestige types can now use features for custom prestige types.

v2.3.2 - 12/13/20

• Fixed achievement/milestone popups.

v2.3.1 - 12/12/20

• Another attempt to fix flickering tooltips.
• The "this" keyword should work everywhere except tabFormat arrays (although I may have missed some things).
• Fixed tree branches not updating when scrolling on the right-side tab.
• Fixed a spacing issue when a node's symbol is ""
• Removed some old, unneeded files.

v2.3: Cooler and Newer Edition - 12/10/20

• Added achievement/milestone popups (thank you to Jacorb for this contribution!)
• The changelog tab is back, and can be set in mod.js.
• Layer nodes and respec buttons will not be clicked by pressing "enter".
• Possible fix for flickering tooltips and strange transitions.
• The victory screen text is configurable.
• Added image and textStyle features to achievements.
• Added an argument to use specific rows in an "upgrades" component.
• Fixed the comma appearing in the main display when there was no effectDescription
• Added the ability to easily make a tab that is a collection of layers in subtabs.
• Improved spacing for embedding layers with subtabs into subtabs.

v2.2.8 - 12/03/20

• Double-clicking a layer node brings you to the main subtab for that layer.
• Attempted to fix challenges visually updating a different way.
• Added a softcap function for use in formulas.
• Added displayRow feature, which lets layers be shown somewhere separate from where they are in the reset order (e.g. side layers)
• Fixed autoupgrade issue.

v2.2.7 - 11/30/20

• Added autoUpgrade feature.
• resource-display now shows resource gain per second if passiveGain is active.
• Fixed formatting issues on some large numbers.
• Better support for using classed objects in player and in layers/tmp.
• Made hard resetting more effective.
• Removed Herobrine from getStartClickables.

v2.2.6 - 11/30/20

• Added goalDescription for challenges and made the new "canComplete" system the standard.
• Another attempt to fix challenges not visually updating.
• Fixed side layers not appearing.
• Fixed getStartClickables again.

v2.2.5 - 11/29/20

• Added features for overriding the displays and costs/goals of upgrades and challenges to make them fully custom.
• best, total, and unlocked are always automatically added to layerData (but best and total will only display if you add them yourself).
• Fixed getStartClickables.

v2.2.4 - 11/28/20

• Added softcap and softcapPower features (for Normal layers)
• Offline time limit and default max tick length were fixed (previously the limits were 1000x too large)
• Added fixOldSaves.
• You can use HTML in main-display.
• Fixed a number of minor oddities.

v2.2.3 - 11/28/20

• Layers will be highlighted if you can finish a challenge.
• The "can complete challenge" color now overrides the "already completed" color.
• Button nodes now work as side "layers".
• Setting a tooltip to "" hides it entirely.

v2.2.2 - 11/22/20

• Fixed right half of the screen being unclickable in some circumstances.
• Fixed tree branches being offset.
• Fix to lastSafeTab.

v2.2.1 - 11/7/20

• Added a small highlight to layers you can meaningfully prestige on.
• Added passiveGeneration and autoPrestige features to standardize prestige automation. (The old ways still work, but the new ones work better with other things)
• Improved milestones visually a bit.
• "best" and "total" are now only displayed if present in startData.
• Fixed issues with things not updating visually. (Thank you to to Jacorb!)
• Side layers and button nodes can now be highlighted.
• Updated docs on the new tree-related features.

v2.2: Uprooted - 11/7/20

• You can now embed a layer inside of a subtab or microtab!
• Added support for hiding or reformatting the tree tab
• Added non-layer button nodes
• Added shouldNotify to subtab/microtab buttons. (You can make them highlighted)
• Added commas to large exponents.
• Upgrades now only show "currently" if they have an effectDisplay (so not for constant effects).
• Achievements are part of the default tab format.
• NaN is now handled more intelligently.
• Renamed files, and moved less relevant ones to another folder.
• The "hide completed challenges" setting now only hides challenges at max completions.
• Thank you to thepaperpilot for fixing errors in docs and improving the infobox appearance!
• Many other minor fixes.

v2.1.4 - 10/25/20

• Added an infobox component. Thank you to thepaperpilot for this contribution!
• Layer type is now optional, and defaults to "none".
• Improved the look of bars and tab buttons.
• Improved spacing between layer nodes (also thanks to thepaperpilot!)
• Fixed the "blank" component breaking if only specifying the height.
• Fixed some numbers not displaying with enough digits.
• Made a few more things able to be functions.
• A few other minor fixes.

v2.1.3.1 - 10/21/20

• Fixed the update function.

v2.1.3 - 10/21/20

• gainMult and gainExp are now optional.
• Layer unlocking is now kept on reset.
• Game should start up faster.
• Layer updates now have a determined order and starts with earlier-rowed layers.
• Automation now has a determined order and starts with later-rowed layers.
• Fixed issues with resetting clickables and challenges.
• Commas should no longer appear in the decimal places of a number.
• Fixed potential issue in displaying the tree.

v2.1.2 - 10/19/20

• Added buyUpgrade function (buyUpg still works though)
• Added author name to modInfo.
• Fix to crash caused when the name of a subtab or microtab is changed.
• Fixes to outdated information in docs.
• Improvements to Discord links.
• Thank you to thepaperpilot for contributing to this update!

v2.1.1 - 10/17/20

• Added resource-display component, which displays the base currency for the prestige layer, as well as the best and/or total of this layer's prestige currency.
• Fixed the value for the base currency not updating in resource-display.

v2.1: We should have thought of this sooner! - 10/17/20

• Moved most of the code users will want to edit to mod.js, added documentation for it.
  • Specifically, modInfo, VERSION, canGenPoints, getPointGen, and maxTickLength
• Added getStartPoints()
• Added the ability to store non-layer-related data
• Added the ability to display more things at the top of the tree tab below points.
• Made the endgame condition customizable
• Added "sell one" and "sell all" buttons for buyables.
• Moved the old "game" to demo.js, and replaced it with a minimal game that won't cause issues when edited.
• Fixed issues with version number
• Fixed number formatting issue making things like "10e9" appear.

v2.0.5 - 10/16/20

• Made more features (including prestige parameters) able to be dynamic.
• Layer nodes can be hidden but still take up space with "ghost" visibility
• Added clickableEffect for real.
• Fixed some visual issues with bars.
• A few other minor tweaks and improvements.

v2.0.4 - 10/16/20

• Fixed HTML on buttons interfering with clicking on them.

v2.0.3 - 10/16/20

• Fixed hotkeys not displaying in info.
• Fixed the game supressing all external hotkeys.
• You can use more things as currencies for upgrade costs and challenge goals using currencyLocation.
• Added maxTickLength, which can be used to prevent offline time or tab-switching from breaking time-limit based mechanics.
• Made buyable respec buttons and clickable "master" buttons their own components, and gave them a hide/show feature.
• Added a general "tooltip" feature for achievements.

v2.0.2 - 10/15/20

• Branches are now dynamic (they can be functions).
• Fixed a crash related to offline time.
• Fixed links being too wide.

v2.0.1 - 10/15/20

• Fixed side layers appearing multiple times.

v2.0: The Pinnacle of Achievement Mountain - 10/15/20

• Added progress bars, which are highly customizable and can be horizontal or vertical!
• Added "side layers", displayed smaller and off to the side, and don't get reset by default. They can be used for global achievements and statistics. Speaking of which...
• Added achievements!
• Added clickables, a more generalized variant of buyables.
• Almost every value in layer data can be either a function or a constant value!
• Added support for multiple completions of challenges.
• Added "none" prestige type, which removes the need for any other prestige-related features.
• The points display and other gui elements stay at the top of the screen when the tree scrolls.
• Added getter/setter functions for the amounts and effects of most Big Features
• Moved modInfo to game.js, added a spot in modInfo for a Discord link, changelog link. Also added a separate mod version from the TMT version in VERSION.
• Tree structure is based on layer data, no index.html editing is needed.
• Tmp does not need to be manually updated.
• You don't have to have the same amount of upgrades in every row (and challs and buyables)
• "unlocked" is optional for all Big Components (defaults to true).
• All displays will update correctly.
• Changelog is no longer in index.html at all.
• Generation of Points now happens in the main game loop
• Changed the reset functions to make keeping things easier
• Renamed many things to increase readability (see the list in the link below)
• Improved documentation based on feedback

v1.3.5:

• Completely automated convertToDecimal, now you never have to worry about it again.
• Branches can be defined without a color id. But they can also use hex values for color ids!
• Created a tutorial for getting started with TMT and Github.
• Page title is now automatically taken from mod name.

v1.3.4 - 10/8/20

• Added "midsection" feature to add things to a tab's layout while still keeping the standard layout.
• Fix for being able to buy more buyables than you should.

v1.3.3 - 10/7/20

• Fix for the "order of operations" issue in temp.

v1.3.1 - 10/7/20

• Added custom CSS and tooltips for Layer Nodes.
• Added custom CSS for upgrades, buyables, milestones, and challenges, both individually and layer-wide.
• You can now use HTML in most display text!
• You can now make milestones unlockable and not display immediately.
• Fixed importing saves, and issue with upgrades not appearing, and probably more.
• Optional "name" layer feature, used in confirmation messages.

v1.3: Tabception... ception! - 10/7/20

• Added subtabs! And also a Micro-tab component to let you make smaller subtab-esque areas anywhere.
• Added a "custom" prestige formula type, and a number of features to support it.
• Added points/sec display (can be disabled).
• Added h-line, v-line and image-display components, plus components for individual upgrades, challenges, and milestones.
• Added upgEffect, buyableEffect, and challEffect functions.
• Added "hide completed challenges" setting.
• Moved old changelogs to a separate place.
• Fixed hasMilestone and incr_order.
• Static layers now show the currency amount needed for the next one if you can buy max.

v1.2.4 - 10/4/20

• Layers are now highlighted if you can buy an upgrade, and a new feature, shouldNotify, lets you make it highlight other ways.
• Fixed bugs with hasUpg, hasChall, hasMilestone, and inChallenge.
• Changed the sample code to use the above functions for convenience.

v1.2.3 - 10/3/20

• Added a row component, which displays a list of objects in a row.
• Added a column component, which displays a list of objects in a column (useful within a row).
• Changed blanks to have a customizable width and height.

v1.2: This Changes Everything! - 10/3/20

• Many layer features can now be static values or functions. (This made some formats change, which will break old things)
• You can now use the "this" keyword, to make code easier to transfer when making new layers.
• Also added "this.layer", which is the current layer's name, and works on existing subfeatures (e.g. individual upgrades) as well! Subfeatures also have "this.id".
• Fixed a big save issue. If you use a unique mod id, your save will never conflict with other mods.
• Added a configurable offline time limit in modinfo at the top of index.html. (default 1 hour)
• Added a few minor features, and updated the docs with new information.

v1.1.1 - 9/30/20

• You can define hotkeys directly from layer config.

v1.1: Enhanced Edition - 9/30/20

• Added "Buyables", which can function like Space Buildings or Enhancers.
• Custom CSS can now be used on any component! Make the third argument an object with CSS parameters.
• Lots of minor good things.

v1.0 - 9/27/20

• First release.